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BEGIN:VEVENT
SUMMARY:Nonlinear response and fluctuations of a driven particle in simple
model fluids
DTSTART;VALUE=DATE-TIME:20191211T170000Z
DTEND;VALUE=DATE-TIME:20191211T171500Z
DTSTAMP;VALUE=DATE-TIME:20200921T070757Z
UID:indico-contribution-17130-106914@agenda.infn.it
DESCRIPTION:Speakers: Alessandro Sarracino (Dipartimento di Ingegneria\, U
niversità della Campania "L. Vanvitelli")\nWe present some results on the
dynamics of a driven tracer particle beyond the linear regime\, in two di
fferent model fluids. We first focus on a lattice gas model -- where the t
racer interacts via hard-core repulsion with a crowding particle bath -- w
hich allows for analytical computations. In this model\, two surprising ph
enomena can occur: negative differential mobility\, namely a nonmonotonic
force-velocity relation\, and enhanced diffusivity induced by the crowding
interactions. Then\, we consider the dynamics of a driven interial partic
le in a steady laminar flow. Here we can observe the phenomenon of absolut
e negative mobility\, where the tracer velocity is opposite to the applied
external force. In this framework\, we also study the dynamics of an acti
ve particle with finite persistence time and discuss a generalized fluctua
tion-dissipation relation\, involving the correlation with non-equilibrium
extra-terms.\n\nhttps://agenda.infn.it/event/17130/contributions/106914/
LOCATION:Salone degli Affreschi\, Palazzo Ateneo Università "Aldo Moro" B
ari
URL:https://agenda.infn.it/event/17130/contributions/106914/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Heterogeneity\, visco-elasticity and the universality class of ear
thquake occurrence
DTSTART;VALUE=DATE-TIME:20191211T144500Z
DTEND;VALUE=DATE-TIME:20191211T150000Z
DTSTAMP;VALUE=DATE-TIME:20200921T070757Z
UID:indico-contribution-17130-106910@agenda.infn.it
DESCRIPTION:Speakers: Eugenio Lippiello ()\nThe organization in time\, spa
ce and energy of earthquakes exhibits scaling laws with exponents $\\alpha
\,\\beta\,\\gamma$ and $p$ \nwhich are universal\, i.e. they are independe
nt of time and of the geographic region. \nA possible explanation of this
critical-like behavior is provided by the possibility to describe the evol
ution of a seismic fault \nunder friction within the general context of th
e depinning transition. In fact\, minimal models for the seismic fault\, s
uch as the Burridge-Knopoff model\, can be mapped to classical quenched E
dwards-Wilkinson (qEW) interfaces. Nevertheless the exponents of the scali
ng laws \nof the qEW interfaces are different from those exhibited by inst
rumental earthquakes. \nIn this talk I will present a more realistic descr
iption of the seismic fault which can be viewed as a qEW interface evolvin
g over \na viscous-ductile substrate. I will show that this description pr
oduces scaling laws with exponents $\\alpha\,\\beta\,\\gamma$ and $p$ in v
ery good agreement with experimental values. More precisely\, the values o
f the exponents $\\alpha\,\\beta$ and $\\gamma$ are quite independent of m
odel parameters and this explains their universal character. Conversely th
e exponent $p$\, controlling the temporal clustering of seismic sequences\
,\ndepends on the specific law implemented for the viscosity. The value $p
=1$ of instrumental data is recovered assuming a velocity-strengthening la
w for the viscous layer\, which is a quite realistic description of real f
ault systems.\n\nhttps://agenda.infn.it/event/17130/contributions/106910/
LOCATION:Salone degli Affreschi\, Palazzo Ateneo Università "Aldo Moro" B
ari
URL:https://agenda.infn.it/event/17130/contributions/106910/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Condensate in quasi-two-dimensional turbulence
DTSTART;VALUE=DATE-TIME:20191211T150000Z
DTEND;VALUE=DATE-TIME:20191211T151500Z
DTSTAMP;VALUE=DATE-TIME:20200921T070757Z
UID:indico-contribution-17130-106909@agenda.infn.it
DESCRIPTION:Speakers: Stefano Musacchio (Istituto Nazionale di Fisica Nucl
eare)\nWe investigate the process of formation of large-scale structures i
n a turbulent flow confined in a thin layer. By means of direct numerical
simulations of the Navier-Stokes equations\, forced at an intermediate sca
le\, we obtain a split of the energy cascade in which one fraction of the
input goes to small scales generating the three-dimensional direct cascade
. The remaining energy flows to large scales producing the inverse cascade
which eventually causes the formation of a quasi-two-dimensional condense
d state at the largest horizontal scale. Our results show that the connect
ion between the two actors of the split energy cascade in thin layers is t
ighter than what was established before: the small-scale three-dimensional
turbulence acts as an effective viscosity and dissipates the large-scale
energy thus providing a viscosity-independent mechanism for arresting the
growth of the condensate. This scenario is supported by quantitative predi
ctions of the saturation energy in the condensate.\n\nhttps://agenda.infn.
it/event/17130/contributions/106909/
LOCATION:Salone degli Affreschi\, Palazzo Ateneo Università "Aldo Moro" B
ari
URL:https://agenda.infn.it/event/17130/contributions/106909/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Spin-waves and multimerization for many-body bound states in the c
ontinuum in one-dimensional qubit arrays
DTSTART;VALUE=DATE-TIME:20191211T114500Z
DTEND;VALUE=DATE-TIME:20191211T120000Z
DTSTAMP;VALUE=DATE-TIME:20200921T070757Z
UID:indico-contribution-17130-106929@agenda.infn.it
DESCRIPTION:Speakers: Domenico Pomarico (BA)\nBound states in the continuu
m are extensively studied both theoretically and experimentally\, with the
aim of implementing noiseless memories. In quantum optics\, models adopte
d for their description make use of the dipolar interaction\, representing
an exactly solvable case in the one-excitation sector. We characterize th
e eigensystem for any number of equally spaced qubits embedded in one dime
nsion using non-perturbative techniques\, giving an explicit proof of exci
tation amplitude profiles ruled by spin-waves and including a description
of the degeneracy lifting obtained through the full analytic structure of
the complex energy plane imposed by the form factor. For any odd number of
qubits\, the singularity condition can be factorized\, so yielding the em
ergence of multimers\, consisting in subsystems separated by two lattice s
pacings not filled by the electromagnetic field. Our model is suitable for
the description of steady states in waveguide QED\, even if its abstracti
on includes more general bosonic fields.\n\nhttps://agenda.infn.it/event/1
7130/contributions/106929/
LOCATION:Salone degli Affreschi\, Palazzo Ateneo Università "Aldo Moro" B
ari
URL:https://agenda.infn.it/event/17130/contributions/106929/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Tensor networks: simulating quantum many-body systems and beyond
DTSTART;VALUE=DATE-TIME:20191211T091500Z
DTEND;VALUE=DATE-TIME:20191211T093000Z
DTSTAMP;VALUE=DATE-TIME:20200921T070757Z
UID:indico-contribution-17130-106919@agenda.infn.it
DESCRIPTION:Speakers: Simone Notarnicola (University of Padova and INFN)\n
In this seminar we briefly review the current status of tensor network met
hods\, a numerical techniques for performing efficient classical numerical
simulations of quantum many-body systems. Tensor network methods promise
to become a powerful tool for benchmarking and results verification of fut
ure quantum simulations and computations. We will review some of the possi
ble applications of this versatile techniques\, ranging from lattice gauge
theories to applications in the fields of machine learning and optimizati
on.\n\nhttps://agenda.infn.it/event/17130/contributions/106919/
LOCATION:Salone degli Affreschi\, Palazzo Ateneo Università "Aldo Moro" B
ari
URL:https://agenda.infn.it/event/17130/contributions/106919/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The role of phase transitions in triggering the emergence of colle
ctive intelligence in human groups: an experimental investigation
DTSTART;VALUE=DATE-TIME:20191211T093000Z
DTEND;VALUE=DATE-TIME:20191211T094500Z
DTSTAMP;VALUE=DATE-TIME:20200921T070757Z
UID:indico-contribution-17130-106916@agenda.infn.it
DESCRIPTION:Speakers: Giovanni Francesco Massari (Politecnico di Bari)\nHu
man groups face with problem-solving through autonomous and self-organized
processes of collective decision-making. Among scientists\, statistical p
hysicists have studied large collective systems in nature (make examples)
and\, in particular\, how the dynamics of collective decision-making affec
t the overall performance of the system. At the local scale\, repeated and
non-linear interactions among the system’s components (the individuals
in the group) trigger the emergence of new and unpredicted patterns at the
global scale (the group)\, where non-linear phenomena like phase transiti
ons\, bifurcations\, scaling\, and self-organization have been observed. I
n the context of human groups\, the emergence of Collective Intelligence (
CI) explains why groups manifest abilities of problem solving higher than
those characterizing its individual members. Recently\, the dynamics of gr
oup decision-making has been modelled through a combined process of consen
sus-seeking and individual search for high-performing solutions on the pro
blem space. The correspondent numerical simulations have proven that group
s undergo a critical phase transition from low to high performance\, depen
ding on the strength of social interactions among the agents and the level
of self-confidence the individuals have about their knowledge of the prob
lem. While social interactions strengthen the mechanism of consensus-seeki
ng within the group\, the level of self-confidence drives the agents towar
ds effective exploration of the problem space. Here\, we provide empirical
evidence for these results. We performed behavioural experiments of group
decision-making to assess whether and how the strength of social interact
ions among the agents in the group influence group performance during prob
lem-solving. The empirical results confirm that social interactions influe
nce the dynamics of group decision-making in real human groups. We found t
hat a critical level of the strength of social interaction\, equal to that
predicted by numerical simulations\, triggers a phase transition from low
to high values on the level of consensus among the agents in the group an
d a similar steep increase on the group performance.\n\nhttps://agenda.inf
n.it/event/17130/contributions/106916/
LOCATION:Salone degli Affreschi\, Palazzo Ateneo Università "Aldo Moro" B
ari
URL:https://agenda.infn.it/event/17130/contributions/106916/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Real time dynamics\, confinement and phase transitions in Z_n Schw
inger-Weyl lattice models for 1+1 QED
DTSTART;VALUE=DATE-TIME:20191211T111500Z
DTEND;VALUE=DATE-TIME:20191211T113000Z
DTSTAMP;VALUE=DATE-TIME:20200921T070757Z
UID:indico-contribution-17130-106924@agenda.infn.it
DESCRIPTION:Speakers: Francesco Vincenzo Pepe (BA)\nWe study the out-of-eq
uilibrium properties of (1+1)-dimensional quantum electrodynamics (QED)\,
discretized via the staggered-fermion Schwinger model with an Abelian Z_n
gauge group. We look at two relevant phenomena: first\, we analyze the sta
bility of the Dirac vacuum with respect to particle/antiparticle pair prod
uction\, both spontaneous and induced by an external electric field\; then
\, we examine the string breaking mechanism. We observe a strong effect of
confinement\, which acts by suppressing both spontaneous pair production
and string breaking into quark/antiquark pairs\, indicating that the syste
m dynamics deviates from the expected behavior toward thermalization. We f
inally comment on the ground state properties of the considered models and
on the evidence of phase transitions.\nReferences:\n- G. Magnifico et al.
\, Real Time Dynamics and Confinement in the Z_n Schwinger-Weyl lattice mo
del for 1+1 QED\, arXiv: 1909.04821 (2019)\n- E. Ercolessi et al.\, Phase
Transitions in Z_n Gauge Models: Towards Quantum Simulations of the Schwin
ger-Weyl QED\, Phys. Rev. D 98\, 074503 (2018)\n- S. Notarnicola et al.\,
Discrete Abelian Gauge Theories for Quantum Simulations of QED\, J. Phys.
A: Math. Theor. 48\, 30FT01 (2015)\n\nhttps://agenda.infn.it/event/17130/c
ontributions/106924/
LOCATION:Salone degli Affreschi\, Palazzo Ateneo Università "Aldo Moro" B
ari
URL:https://agenda.infn.it/event/17130/contributions/106924/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Non-equilibrium pattern formation in active matter
DTSTART;VALUE=DATE-TIME:20191213T120000Z
DTEND;VALUE=DATE-TIME:20191213T123000Z
DTSTAMP;VALUE=DATE-TIME:20200921T070757Z
UID:indico-contribution-17130-106958@agenda.infn.it
DESCRIPTION:Speakers: Demian Levis (University of Barcelona)\nActive matte
r\, popularized by the collective motion of bird flocks\, constitutes a no
vel and rapidly growing field gathering interests and contributions from v
ery diverse communities. In particular\, it offers new promises in organiz
ing elementary units at different scales in ways that are unavailable to e
quilibrium systems\, like clustering and phase separation without attracti
ve interactions\, dense fronts of coherently moving entities\, etc. At a f
undamental level\, this new physics emerging in active matter has been mos
tly understood in terms of simplified particle models\, which allow to ide
ntify the key ingredients giving rise to such non-equilibrium collective p
henomena. However\, properly controlling the self-assembly of active parti
cles is still an open challenge. \nHere we consider chiral active matter
\, composed of large assemblies of polar circle swimmers\, i.e. polar acti
ve particles that follow circular trajectories (like bacteria suspensions
in two dimensions or asymmetric L-shaped chiral self-propelled colloids).
We show that rotations induce a plethora of new collective behaviors as c
ompared to non-rotating particles and\, in particular\, they provide a nov
el generic route to pattern formation. We show that slow rotations induce
phase separation while faster rotations result in the emergence of pattern
s of smaller synchronized structures with self-limited size\, such as tho
se observed in suspensions of sperm cells. Most remarkably\, we show that
the size of these patterns can be directly controlled by the microscopic p
arameters of the model in a simple way. Moreover\, in the presence of a di
stribution of rotation frequencies\, they can synchronize over very large
distances\, even in 2D\, as opposed to non-active oscillators on static or
time-dependent networks\, usually leading to synchronized domains only.
We finally discuss some experimental observations in suspensions of magnet
ic colloids that can be understood within this framework.\n\nhttps://agend
a.infn.it/event/17130/contributions/106958/
LOCATION:Salone degli Affreschi\, Palazzo Ateneo Università "Aldo Moro" B
ari
URL:https://agenda.infn.it/event/17130/contributions/106958/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Topology via Spectral Projectors with Staggered Fermions
DTSTART;VALUE=DATE-TIME:20191213T114500Z
DTEND;VALUE=DATE-TIME:20191213T120000Z
DTSTAMP;VALUE=DATE-TIME:20200921T070757Z
UID:indico-contribution-17130-106963@agenda.infn.it
DESCRIPTION:Speakers: Claudio Bonanno (PI)\nSpectral projectors on the eig
enmodes of the Dirac operator can be used to derive a fermionic lattice de
finition of the topological charge. Studying the renormalization propertie
s of the lattice charge\, we extend the spectral projectors definition of
the topological susceptibility to the case of staggered fermions. Besides\
, we also generalize the spectral method to any higher-order cumulant of t
he topological charge. Finally\, we present results obtained in the quench
ed case for the topological susceptibility and for the fourth cumulant\, a
s well as some preliminary results in full QCD.\n\nhttps://agenda.infn.it/
event/17130/contributions/106963/
LOCATION:Salone degli Affreschi\, Palazzo Ateneo Università "Aldo Moro" B
ari
URL:https://agenda.infn.it/event/17130/contributions/106963/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Topology and Center Symmetry in Yang-Mills theories
DTSTART;VALUE=DATE-TIME:20191213T113000Z
DTEND;VALUE=DATE-TIME:20191213T114500Z
DTSTAMP;VALUE=DATE-TIME:20200921T070757Z
UID:indico-contribution-17130-106962@agenda.infn.it
DESCRIPTION:Speakers: Marco Cardinali (Istituto Nazionale di Fisica Nuclea
re)\nIn this work we investigate the relation between the realization of c
enter symmetry and the theta-dependence of\nSU(3) and SU(4) Yang-Mills the
ories defined on $R^3 \\times S^1$. In particular we use the double-traced
deformed version of Yang-Mills theory\,\nin which extra pieces coupled to
the traces of the powers of Polyakov loop are addedd to the standard acti
on in order\nrecover center symmetry even at small compactification radii.
First we study the phase diagram in the deformation plane\; then we compu
te the topological susceptibility and the first term of the theta expansio
n of the free energy in the deformed theory and we compare them with the k
nown values of the undeformed one.\n\nhttps://agenda.infn.it/event/17130/c
ontributions/106962/
LOCATION:Salone degli Affreschi\, Palazzo Ateneo Università "Aldo Moro" B
ari
URL:https://agenda.infn.it/event/17130/contributions/106962/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Perturbations and boundaries in flocking systems
DTSTART;VALUE=DATE-TIME:20191213T103000Z
DTEND;VALUE=DATE-TIME:20191213T110000Z
DTSTAMP;VALUE=DATE-TIME:20200921T070757Z
UID:indico-contribution-17130-106961@agenda.infn.it
DESCRIPTION:Speakers: Francesco Ginelli (Università dell'Insubria)\nPolar
flocking is one of the simplest but at the same time richer examples of c
ollective behaviour in active matter systems. Its physical behaviour — s
temming from the spontaneous breaking of a continuous symmetry and the non
equilibrium coupling of density and orientation fluctuations — has been
thoroughly investigated in the last two decades\, and we now have a good u
nderstanding of the asymptotic behaviour of isolated systems\, at least in
the dry and dilute approximation.\n\nConsidering flocks that are not isol
ated\, but rather immersed and interacting with the external world\, on th
e other hand\, forces one to consider the effect of boundaries\, surface t
ension and/or the response to external perturbations. Surface tension\, fo
r instance\, is needed to maintain flock cohesion\, and due to their non-e
quilibrium activity\, finite flocks exhibit faster than equilibrium surfac
e fluctuations. The information inflow from the boundary\, moreover\, may
also alter bulk correlations\, both for isolated flocks or in the presence
of an external perturbations. Asymptotic linear response theory will also
be discussed and compared with recent experimental results in active coll
oids.\n\nhttps://agenda.infn.it/event/17130/contributions/106961/
LOCATION:Salone degli Affreschi\, Palazzo Ateneo Università "Aldo Moro" B
ari
URL:https://agenda.infn.it/event/17130/contributions/106961/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dynamical Generation of Elementary Fermion Mass: First Lattice Evi
dence
DTSTART;VALUE=DATE-TIME:20191213T111500Z
DTEND;VALUE=DATE-TIME:20191213T113000Z
DTSTAMP;VALUE=DATE-TIME:20200921T070757Z
UID:indico-contribution-17130-106960@agenda.infn.it
DESCRIPTION:Speakers: Marco Garofalo (Università degli studi di Roma3 )\n
Using lattice simulations we give evidence of the existence of a non-pertu
rbative mechanism for elementary particle mass generation in models with g
auge fields\, fermions and scalars\, if an exact invariance forbids power
divergent fermion masses and fermionic chiral symmetries broken at UV scal
e are maximally restored. We show that in the Nambu-Goldstone phase a ferm
ion mass term\, unrelated to the Yukawa operator\, is dynamically generate
d.\n\nhttps://agenda.infn.it/event/17130/contributions/106960/
LOCATION:Salone degli Affreschi\, Palazzo Ateneo Università "Aldo Moro" B
ari
URL:https://agenda.infn.it/event/17130/contributions/106960/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Real photon emissions in leptonic decays of mesons
DTSTART;VALUE=DATE-TIME:20191213T110000Z
DTEND;VALUE=DATE-TIME:20191213T111500Z
DTSTAMP;VALUE=DATE-TIME:20200921T070757Z
UID:indico-contribution-17130-106959@agenda.infn.it
DESCRIPTION:Speakers: Francesco Sanfilippo (INFN - Sezione Roma III)\nWe p
resent a novel framework to compute the non-perturbative decay width of ps
eudoscalar mesons into charged leptons by means of Lattice QCD calculation
s\, including for the first time the radiative emission of a photon. Toget
her with the non-perturbative determination of the virtual photon correcti
ons to the processes\, this allow accurate predictions at O(αem) for lept
onic decay rates for pseudoscalar mesons\, significantly improving the pre
cision in the determination of the corresponding Cabibbo-Kobayashi-Maskawa
(CKM) matrix elements.\n\nhttps://agenda.infn.it/event/17130/contribution
s/106959/
LOCATION:Salone degli Affreschi\, Palazzo Ateneo Università "Aldo Moro" B
ari
URL:https://agenda.infn.it/event/17130/contributions/106959/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Forgotten modular bootstrap equations and 3d quantum gravity
DTSTART;VALUE=DATE-TIME:20191213T083000Z
DTEND;VALUE=DATE-TIME:20191213T084500Z
DTSTAMP;VALUE=DATE-TIME:20200921T070757Z
UID:indico-contribution-17130-106957@agenda.infn.it
DESCRIPTION:Speakers: Ferdinando Gliozzi (INFN\, Sezione di Torino)\nThe m
odular bootstrap program for two-dimensional conformal field theories coul
d be seen as a systematic exploration of the physical consequences of con
sistency conditions at the elliptic points and at the cusp of their torus
partition function. The study at $\\tau=i$\, the elliptic point stabilized
by the modular inversion $S$\, was initiated in 2009 by Hellerman\, who f
ound a general upper bound for the most relevant scaling dimension $\\Delt
a_0$. Likewise\, analyticity at $\\tau=i\\infty$\, the cusp stabilized by
the modular translation $T$\, yields an upper bound on the twist gap\, whe
reas to date\nthe study at $\\tau=\\exp[2i\\pi/3]$\, the elliptic point st
abilized by $S\\\,T$ has been neglected. \nHere I found a far stronger up
per bound in the large-$c$ limit which is remarkably close to\n the minim
al mass threshold of the BTZ black holes in the holographic dual $3d$ gr
avity. Even a modest improvement could push $\\Delta_0$ down this thresh
old\, implying that \npure Einstein gravity do not exist as a quantum the
ory.\n\nhttps://agenda.infn.it/event/17130/contributions/106957/
LOCATION:Salone degli Affreschi\, Palazzo Ateneo Università "Aldo Moro" B
ari
URL:https://agenda.infn.it/event/17130/contributions/106957/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Competing coherent and dissipative dynamics close to quantum criti
cality
DTSTART;VALUE=DATE-TIME:20191213T094500Z
DTEND;VALUE=DATE-TIME:20191213T100000Z
DTSTAMP;VALUE=DATE-TIME:20200921T070757Z
UID:indico-contribution-17130-106956@agenda.infn.it
DESCRIPTION:Speakers: Davide Rossini (PI)\nWe investigate the competition
of coherent and dissipative dynamics in many-body systems at continuous qu
antum transitions. We consider dissipative mechanisms that can be effectiv
ely described by Lindblad equations for the density matrix of the system.
The interplay between the critical coherent dynamics and dissipation is ad
dressed within a dynamic finite-size scaling framework\, which allows us t
o identify the regime where they develop a nontrivial competition. We anal
yze protocols that start from critical many-body ground states\, and put f
orward general dynamic scaling behaviors involving the Hamiltonian paramet
ers and the coupling associated with the dissipation. This scaling scenari
o is supported by a numerical study of the dynamic behavior of a one-dimen
sional lattice fermion gas undergoing a quantum Ising transition\, in the
presence of dissipative mechanisms such as local pumping\, decaying and de
phasing.\n\nhttps://agenda.infn.it/event/17130/contributions/106956/
LOCATION:Salone degli Affreschi\, Palazzo Ateneo Università "Aldo Moro" B
ari
URL:https://agenda.infn.it/event/17130/contributions/106956/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Conformal field theory and the hot phase of the three-dimensional
U(1) gauge theory
DTSTART;VALUE=DATE-TIME:20191213T093000Z
DTEND;VALUE=DATE-TIME:20191213T094500Z
DTSTAMP;VALUE=DATE-TIME:20200921T070757Z
UID:indico-contribution-17130-106955@agenda.infn.it
DESCRIPTION:Speakers: Alessandro Nada (DESY Zeuthen)\nIn this talk I will
present recent results showing how the high-temperature phase of the compa
ct U(1) gauge theory without matter fields in 2+1 spacetime dimensions can
be studied in terms of conformal-field-theory predictions for the low-tem
perature phase of the XY model in 2 dimensions. The conformally-invariant
analytical description of the XY model is compared with numerical results
obtained in lattice simulations of the U(1) gauge theory above the critica
l temperature\, in particular for the two-point correlation function of st
atic charges and for the profile of the flux tube: excellent quantitative
agreement is found with predictions for the functional forms and for the c
ritical indices.\n\nhttps://agenda.infn.it/event/17130/contributions/10695
5/
LOCATION:Salone degli Affreschi\, Palazzo Ateneo Università "Aldo Moro" B
ari
URL:https://agenda.infn.it/event/17130/contributions/106955/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Phase transitions in the unconstrained ensemble
DTSTART;VALUE=DATE-TIME:20191213T080000Z
DTEND;VALUE=DATE-TIME:20191213T083000Z
DTSTAMP;VALUE=DATE-TIME:20200921T070757Z
UID:indico-contribution-17130-106954@agenda.infn.it
DESCRIPTION:Speakers: Stefano Ruffo (SISSA)\nT.B.A.\n\nhttps://agenda.infn
.it/event/17130/contributions/106954/
LOCATION:Salone degli Affreschi\, Palazzo Ateneo Università "Aldo Moro" B
ari
URL:https://agenda.infn.it/event/17130/contributions/106954/
END:VEVENT
BEGIN:VEVENT
SUMMARY:QCD at nonzero isospin asymmetry: the Dirac spectrum and the BEC-B
CS crossover
DTSTART;VALUE=DATE-TIME:20191213T091500Z
DTEND;VALUE=DATE-TIME:20191213T093000Z
DTSTAMP;VALUE=DATE-TIME:20200921T070757Z
UID:indico-contribution-17130-106953@agenda.infn.it
DESCRIPTION:Speakers: Francesca Cuteri (Goethe Universität - Frankfurt am
Main)\nWe investigate the complex spectrum of the Dirac operator in 2+1-f
lavor\nQCD\, at nonzero temperature and isospin chemical potential\, using
the\nextension of the Banks-Casher relation to the case of Complex Dirac\
neigenvalues (derived for the zero-temperature\, high-density limits of\nQ
CD at nonzero isospin chemical potential)\, as a prescription to obtain\ni
nformation on the BCS gap from the 2d density of the complex Dirac\neigenv
alues.\nSuch study is motivated by the prediction\, from perturbation theo
ry\, of\na superfluid state of $u$ and $\\bar{d}$ Cooper pairs (BCS phase)
at\nasymptotically high isospin densities\, plausibly connected via an\na
nalytical crossover to the a phase with Bose-Einstein condensation of\ncha
rged pions at $\\mu_I>=m_\\pi/2$.\nFurther motivation comes from recent la
ttice observations (renormalized\nPolyakov loop measurements) that indicat
e a decrease of the\ndeconfinement transition temperature as a function of
\\mu_I\, suggesting\nthat the deconfinement crossover smoothly penetrates
into the pion\ncondensation phase and thus favoring a scenario where the
deconfinement\ntransition connects continuously to the BEC-BCS crossover i
n the\n$(T\,\\mu_I)$ phase diagram.\n\nhttps://agenda.infn.it/event/17130/
contributions/106953/
LOCATION:Salone degli Affreschi\, Palazzo Ateneo Università "Aldo Moro" B
ari
URL:https://agenda.infn.it/event/17130/contributions/106953/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Critical properties of three-dimensional lattice multiflavor scala
r chromodynamics
DTSTART;VALUE=DATE-TIME:20191213T090000Z
DTEND;VALUE=DATE-TIME:20191213T091500Z
DTSTAMP;VALUE=DATE-TIME:20200921T070757Z
UID:indico-contribution-17130-106952@agenda.infn.it
DESCRIPTION:Speakers: Claudio Bonati ()\nWe study the nature of the transi
tion of a three-dimensional lattice scalar model characterized by a nonabe
lian SU($N_c$) gauge symmetry and a continuous global flavor symmetry. For
$N_f>1$ this model presents two different phases\, associated with the sp
ontaneous breaking of the flavor symmetry\, hence it is an ideal tool to i
nvestigate whether the presence of nonabelian gauge symmetry can affect th
e critical properties of a statistical field theory. Two different effecti
ve models are studied\, which are expected to describe the phase transitio
n when the gauge degrees of freedom are relevant (continuum scalar chromod
ynamics) or when they are irrelevant (gauge invariant Landau-Ginzburg-Wils
on approach)\, and their predictions are checked against the results of nu
merical lattice simulations.\n\nhttps://agenda.infn.it/event/17130/contrib
utions/106952/
LOCATION:Salone degli Affreschi\, Palazzo Ateneo Università "Aldo Moro" B
ari
URL:https://agenda.infn.it/event/17130/contributions/106952/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice simulations with non-equilibrium methods
DTSTART;VALUE=DATE-TIME:20191213T084500Z
DTEND;VALUE=DATE-TIME:20191213T090000Z
DTSTAMP;VALUE=DATE-TIME:20200921T070757Z
UID:indico-contribution-17130-106951@agenda.infn.it
DESCRIPTION:Speakers: Marco Panero (TO)\nWe discuss some recent applicatio
ns of non-equilibrium statistical-mechanics theorems in numerical simulati
ons of lattice gauge theories.\n\nhttps://agenda.infn.it/event/17130/contr
ibutions/106951/
LOCATION:Salone degli Affreschi\, Palazzo Ateneo Università "Aldo Moro" B
ari
URL:https://agenda.infn.it/event/17130/contributions/106951/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dual formulations of gauge models with static quarks at finite ba
ryon density
DTSTART;VALUE=DATE-TIME:20191212T170000Z
DTEND;VALUE=DATE-TIME:20191212T171500Z
DTSTAMP;VALUE=DATE-TIME:20200921T070757Z
UID:indico-contribution-17130-106950@agenda.infn.it
DESCRIPTION:Speakers: Oleg Borisenko (Bogolyubov Institute for Theoretical
Physics\, Academy of Sciences of Ukraine)\nConstruction of dual formulat
ions of various abelian Z(N) and non-abelian U(N) and SU(N) lattice gauge
theories with static quarks in the presence of non-vanishing chemical pote
ntial is reviewed. As an application of the dual formulation for models at
finite baryon density we 1) present an exact solution of the Polyakov loo
p models in the large-N limit and 2) discuss the numerical computations of
the Polyakov loop correlations in the SU(3) dual model. Several extension
s of the dual transformations are outlined.\n\nhttps://agenda.infn.it/even
t/17130/contributions/106950/
LOCATION:Salone degli Affreschi\, Palazzo Ateneo Università "Aldo Moro" B
ari
URL:https://agenda.infn.it/event/17130/contributions/106950/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The confining color field in the SU(3) gauge theory
DTSTART;VALUE=DATE-TIME:20191212T171500Z
DTEND;VALUE=DATE-TIME:20191212T173000Z
DTSTAMP;VALUE=DATE-TIME:20200921T070757Z
UID:indico-contribution-17130-106949@agenda.infn.it
DESCRIPTION:Speakers: Volodymyr Chelnokov (Istituto Nazionale di Fisica Nu
cleare)\nThe spatial distribution of the chromoelectric field in presence
of a static quark-antiquark pair in the SU(3) gauge theory is determined f
rom the numerical simulations. The resulting field can be decomposed into
the perturbative part\, and the nonperturbative confining field\, the last
being oriented almost completely along the quark-antiquark line. A way of
performing this decomposition using irrotational property of the perturba
tive field is proposed. The estimation of the string tension and of the pa
rameters of the nonperturbative flux tube is then obtained from the subtra
cted field.\n\nhttps://agenda.infn.it/event/17130/contributions/106949/
LOCATION:Salone degli Affreschi\, Palazzo Ateneo Università "Aldo Moro" B
ari
URL:https://agenda.infn.it/event/17130/contributions/106949/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quantum statistics in Network Geometry with Fractional Flavor
DTSTART;VALUE=DATE-TIME:20191212T161500Z
DTEND;VALUE=DATE-TIME:20191212T163000Z
DTSTAMP;VALUE=DATE-TIME:20200921T070757Z
UID:indico-contribution-17130-106948@agenda.infn.it
DESCRIPTION:Speakers: Andrea Rapisarda (CT)\nQuantum statistics have been
shown to emerge to describe the statistical properties of growing networks
when nodes are associated to a fitness value [1]. Recently it has been sh
own that quantum statistics emerge also in a growing simplicial complex mo
del called Network Geometry with Flavor (NGF) which allows for the descrip
tion of many-body interactions between the nodes [2\,3]. This model depend
s on an external parameter called flavor that is responsible for the under
lying topology of the simplicial complex. When the flavor takes the value
s=−1 the d-dimensional simplicial complex is a manifold in which every (
d−1)-dimensional face can only have an incidence number nα ∈ {0\, 1}.
In this case the faces of the simplicial complex are naturally described
by the Bose–Einstein\, Boltzmann and Fermi–Dirac distribution dependin
g on their dimension. In this paper we extend the study of NGF to fraction
al values of the flavor s = −1/m in which every (d−1)-dimensional face
can only have incidence number nα ∈{0\,1\,2\,...\,m}. We show that in
this case the statistical properties of the faces of the simplicial comple
x are described by the Bose–Einstein or the Fermi–Dirac distribution o
nly. Finally\, we comment on the spectral properties of the networks const
ituting the underlying structure of the considered simplicial complexes [4
].\n\nReferences\n 1. G. Bianconi and A. L. Barabási\, Bose-Einstein Co
ndensation in Complex Networks\, Phys. Rev. Lett. 86\, p 5632 (2001)\n2. G
. Bianconi and C. Rahmede\, Complex Quantum Network Manifolds in Dimension
d > 2 are Scale-Free\, Sci. Rep. 5\, p 13979 (2015)\n3. G. Bianconi
\, C. Rahmede\, Emergent Hyperbolic Network Geometry\, Sci. Rep. 7\, p 419
74 (2017)\n4. N. Cinardi\, A. Rapisarda\, G. Bianconi\, Quantum statistics
in Network Geometry with Fractional Flavor\, J. Stat. Mech\, p 103403 (20
19)\n\nhttps://agenda.infn.it/event/17130/contributions/106948/
LOCATION:Salone degli Affreschi\, Palazzo Ateneo Università "Aldo Moro" B
ari
URL:https://agenda.infn.it/event/17130/contributions/106948/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Acoustic Emissions in Compression of Building Materials: Q-Statist
ics Enables the Anticipation of the Breakdown Point
DTSTART;VALUE=DATE-TIME:20191212T160000Z
DTEND;VALUE=DATE-TIME:20191212T161500Z
DTSTAMP;VALUE=DATE-TIME:20200921T070757Z
UID:indico-contribution-17130-106946@agenda.infn.it
DESCRIPTION:Speakers: Alessandro Pluchino ()\nIn this work we present new
experimental results concerning Acoustic Emission (AE) recorded during cyc
lic compression tests on two different kinds of brittle building materials
\, namely concrete and basalt. The AE inter-event times were investigated
through a non-extensive statistical mechanics analysis which shows that th
eir decumulative probability distributions follow q-exponential laws. The
entropic index q and the relaxation parameter Beta_q = 1/Tq\, obtained by
fitting the experimental data\, exhibit systematic changes during the vari
ous stages of the failure process\, namely (q\; Tq) linearly align. The Tq
= 0 point corresponds to the macroscopic breakdown of the material. The s
lope\, including its sign\, of the linear alignment appears to depend on t
he chemical and mechanical properties of the sample. These results provide
an insight on the warning signs of the incipient failure of building mate
rials and could therefore be used in monitoring the health of existing str
uctures such as buildings and bridges.\n\nhttps://agenda.infn.it/event/171
30/contributions/106946/
LOCATION:Salone degli Affreschi\, Palazzo Ateneo Università "Aldo Moro" B
ari
URL:https://agenda.infn.it/event/17130/contributions/106946/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Parton distribution functions from Lattice QCD
DTSTART;VALUE=DATE-TIME:20191212T163000Z
DTEND;VALUE=DATE-TIME:20191212T170000Z
DTSTAMP;VALUE=DATE-TIME:20200921T070757Z
UID:indico-contribution-17130-106945@agenda.infn.it
DESCRIPTION:Speakers: Savvas Zafeiropoulos (CPT Marseille CNRS)\nThe light
-cone definition of Parton Distribution Functions (PDFs) does not allow fo
r a direct ab initio determination employing methods of Lattice QCD simula
tions that naturally take place in Euclidean spacetime. In this presentati
on we focus on pseudo-PDFs where the starting point is the equal time hadr
onic matrix element with the quark and anti-quark fields separated by a fi
nite distance. We focus on Ioffe-time distributions\, which are functions
of the Ioffe-time ν\, and can be understood as the Fourier transforms of
parton distribution functions with respect to the momentum fraction variab
le x. We present lattice results for the case of the nucleon and the pion
and we also perform a comparison with the pertinent phenomenological deter
minations.\n\nhttps://agenda.infn.it/event/17130/contributions/106945/
LOCATION:Salone degli Affreschi\, Palazzo Ateneo Università "Aldo Moro" B
ari
URL:https://agenda.infn.it/event/17130/contributions/106945/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The post-merger spectrum of binary neutron star mergers
DTSTART;VALUE=DATE-TIME:20191212T150000Z
DTEND;VALUE=DATE-TIME:20191212T151500Z
DTSTAMP;VALUE=DATE-TIME:20200921T070757Z
UID:indico-contribution-17130-106941@agenda.infn.it
DESCRIPTION:Speakers: Roberto De Pietri (PR)\nWe show the properties of th
e gravitational wave signal emitted after the merger of a binary neutron s
tar system. We show that the post-merger phase can be subdivided into thre
e phases: an early post-merger phase (where the quadrupole mode and a few
subdominant features are active)\, the intermediate post-merger phase (whe
re only the quadrupole mode is active) and\, when remnant survives for mor
e than a 60ms before collapsing to a Black Hole\, the late post-merger pha
se (where convective instabilities trigger inertial modes). \n\nMoreover\
, we show how to perform numerical simulations of Binary Neutron Star Merg
ers using the Einstein Toolkit. We discuss the motivation for going to hi
gh-resolution and the computational requirement needed to reach the requir
ed resolution a the numerical performance on the Einstein Toolkit public c
ode. We present vectorization and scaling tests on the code on SkyLake and
Knight’s Landing processors to assess its capability of making use of a
large amount of parallel computing power. Our tests are run on the full
infrastructure\, evolving both the space-time metric variable and matter.\
n\nhttps://agenda.infn.it/event/17130/contributions/106941/
LOCATION:Salone degli Affreschi\, Palazzo Ateneo Università "Aldo Moro" B
ari
URL:https://agenda.infn.it/event/17130/contributions/106941/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The Euclid Mission
DTSTART;VALUE=DATE-TIME:20191212T141500Z
DTEND;VALUE=DATE-TIME:20191212T144500Z
DTSTAMP;VALUE=DATE-TIME:20200921T070757Z
UID:indico-contribution-17130-106944@agenda.infn.it
DESCRIPTION:Speakers: Matteo Tenti (INFN - BO)\nThe European Space Agency'
s Euclid Mission will be launched in 2022. During its six-year mission\, t
he Euclid satellite will survey nearly 40% of the sky\, providing scientis
ts with an extraordinarily large amount of data that will impact many aspe
cts of modern cosmology and astrophysics. The Euclid Mission's primary sci
ence goals are targeted towards constraining the nature of two of the most
puzzling quantities in our Universe: Dark Energy and Dark Matter. In orde
r to do so\, the Euclid Satellite will image billions of galaxies as well
as measure tens of millions of spectra. In this talk we will summarize the
main scientific objectives of the mission\, focusing in particular to the
topics closest to the INFN research interest\, and the computational chal
lenges emerging in the analysis of Euclid data.\n\nhttps://agenda.infn.it/
event/17130/contributions/106944/
LOCATION:Salone degli Affreschi\, Palazzo Ateneo Università "Aldo Moro" B
ari
URL:https://agenda.infn.it/event/17130/contributions/106944/
END:VEVENT
BEGIN:VEVENT
SUMMARY:TEONGRAV: HPC simulations of gravitational wave sources
DTSTART;VALUE=DATE-TIME:20191212T144500Z
DTEND;VALUE=DATE-TIME:20191212T150000Z
DTSTAMP;VALUE=DATE-TIME:20200921T070757Z
UID:indico-contribution-17130-106943@agenda.infn.it
DESCRIPTION:Speakers: Bruno Giacomazzo (University of Milano-Bicocca)\nI w
ill report on the use of INFN HPC resources made by the INFN TEONGRAV grou
p. The focus of the numerical simulations performed within the TEONGRAV co
llaboration is on the modelling of compact object binaries\, as sources of
gravitational waves and electromagnetic signals\, and on the study of the
formation channels of black hole binaries.\n\nhttps://agenda.infn.it/even
t/17130/contributions/106943/
LOCATION:Salone degli Affreschi\, Palazzo Ateneo Università "Aldo Moro" B
ari
URL:https://agenda.infn.it/event/17130/contributions/106943/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The standard cosmological model: current status and future prospec
ts
DTSTART;VALUE=DATE-TIME:20191212T134500Z
DTEND;VALUE=DATE-TIME:20191212T141500Z
DTSTAMP;VALUE=DATE-TIME:20200921T070757Z
UID:indico-contribution-17130-106942@agenda.infn.it
DESCRIPTION:Speakers: Martina Gerbino (Istituto Nazionale di Fisica Nuclea
re)\nCurrent cosmological observations are in agreement with the standard
cosmological model of a homogeneous and isotropic Universe at large scales
\, based on General Relativity and on the standard model (SM) of particle
physics\, complemented with a mechanism for the generation of primordial p
erturbations\, i.e.\, the inflationary paradigm. When interpreted in minim
al extensions of this ΛCDM framework\, cosmological data exhibit no evide
nce for departure from the base model.\nNevertheless\, the great accuracy
of current observations allows to reveal some discrepancies between sets o
f data (e.g.\, CMB versus low-redshift measurements) that might excitingly
point to the need for a beyond-ΛCDM paradigm. More excitingly\, next-gen
eration cosmological surveys have the potential to further investigate the
robustness of these discrepancies\, and in general to unveil signature of
new physics hidden in cosmological probes. \nIn this talk\, I will review
the state-of-the-art of cosmological constraints on fundamental physics a
nd prospects for future observations\, highlighting the contribution of th
e INFN community.\n\nhttps://agenda.infn.it/event/17130/contributions/1069
42/
LOCATION:Salone degli Affreschi\, Palazzo Ateneo Università "Aldo Moro" B
ari
URL:https://agenda.infn.it/event/17130/contributions/106942/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Formation of disks with persistent spiral arms from the gravitatio
nal collapse of out-of-equilibrium dissipative systems
DTSTART;VALUE=DATE-TIME:20191212T151500Z
DTEND;VALUE=DATE-TIME:20191212T153000Z
DTSTAMP;VALUE=DATE-TIME:20200921T070757Z
UID:indico-contribution-17130-106940@agenda.infn.it
DESCRIPTION:Speakers: Francesco Sylos Labini (ROMA1)\nAn out-of-equilibriu
m\, isolated and uniform over-density of massive particles relax towards
a quasi-stationary state close to virial equilibrium through a monolithic
collapse driven by its own mean gravitational field. If the system initia
lly breaks spherical symmetry and has some angular momentum such a dissip
ationless dynamics may give rise to a disk with persistent far out-of-
equilibrium structures like spiral arms\, bars and/or rings. By considerin
g several numerical experiments of a simple toy model\, we also discuss th
e combined effect of gravitational and gas dynamics in such an out-of-equ
ilibrium framework.\n\nhttps://agenda.infn.it/event/17130/contributions/10
6940/
LOCATION:Salone degli Affreschi\, Palazzo Ateneo Università "Aldo Moro" B
ari
URL:https://agenda.infn.it/event/17130/contributions/106940/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Low Rank Non-Negative Matrix Factorization with D-Wave 2000Q
DTSTART;VALUE=DATE-TIME:20191212T120000Z
DTEND;VALUE=DATE-TIME:20191212T121500Z
DTSTAMP;VALUE=DATE-TIME:20200921T070757Z
UID:indico-contribution-17130-106935@agenda.infn.it
DESCRIPTION:Speakers: Ottaviani Daniele (CINECA)\nIn this work we want to
demonstrate the effectiveness of the new D-Wave quantum annealer\, D-Wave
2000Q\, in dealing with real world problems. In particular\, it is shown h
ow the quantum annealing process is able to find global optima even in the
case of problems that do not directly involve binary variables. The probl
em addressed in this work is the following: taking a matrix V\, find two m
atrices W and H such that the norm between V and the matrix product WH is
as small as possible. The work is inspired by O'Malley's article\, where t
he author proposed an algorithm to solve a problem very similar to ours\,
where however the matrix H was formed by only binary variables. In our cas
e neither of the two matrices W or H is a binary matrix. In particular\, t
he factorization foresees that the matrix W is composed of real numbers be
tween 0 and 1 and that the sum of its rows is equal to 1. The QUBO problem
associated with this type of factorization generates a potential composed
of many local minima. We show that simple forward-annealing techniques ar
e not sufficient to solve the problem. The new D-Wave 2000Q has introduced
new solution refinement techniques\, including reverse-annealing. Reverse
-annealing allows to explore the configuration space starting from a point
chosen by the user\, for example a local minimum obtained with a preceden
t forward-annealing. In this article we propose an algorithm based on the
reverse annealing technique (that we called adaptive reverse annealing) ab
le to reach global minimum even in the case of QUBO problems where the cla
ssic forward annealing\, or uncontrolled reverse annealing\, can not reach
satisfactory solutions.\n\nhttps://agenda.infn.it/event/17130/contributio
ns/106935/
LOCATION:Salone degli Affreschi\, Palazzo Ateneo Università "Aldo Moro" B
ari
URL:https://agenda.infn.it/event/17130/contributions/106935/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quantum computing and its applications in chemistry and physics
DTSTART;VALUE=DATE-TIME:20191212T110000Z
DTEND;VALUE=DATE-TIME:20191212T113000Z
DTSTAMP;VALUE=DATE-TIME:20200921T070757Z
UID:indico-contribution-17130-106936@agenda.infn.it
DESCRIPTION:Speakers: Tavernelli Ivano (IBM Research - Zurich)\nQuantum co
mputing is emerging as a new paradigm for the solution of a wide class\nof
problems that are not accessible by conventional high performance compute
rs\nbased on classical algorithms. Quantum computers can in principle ecie
ntly solve\nproblems that require exponential resources on classical hardw
are\, even when using\nthe best known classical algorithms. In the last fe
w years\, several interesting prob-\nlems with potential quantum speedup h
ave been brought forward in the domain of\nquantum physics\, like eigenval
ue-search using quantum phase estimation algorithms\nand evaluation of obs
ervables in quantum chemistry\, e.g. by means of the hybrid\nvariational q
uantum eigensolver (VQE) algorithm.\nThe original idea that a quantum comp
uter can potentially solve many-body\nquantum mechanical problems more eci
ently than classical algorithms is due to R.\nFeynman who proposed to use
quantum algorithms to investigate the fundamental\nproperties of nature at
the quantum scale. In particular\, the simulation of the\nelectronic stru
cture of molecular and condensed matter systems is a challenging\ncomputat
ional task as the cost of resources increases exponentially with the numbe
r\nof electrons when accurate solutions are required. With the deeper unde
rstanding\nof complex quantum systems acquired over the last decades this
exponential barrier\nbottleneck may be overcome by the use of quantum comp
uting hardware. To achieve\nthis goal\, new quantum algorithms need to be
develop that are able to best exploit\nthe potential of quantum speed-up [
1\,2]. While this eort should target the design\nof quantum algorithms for
the future fault-tolerant quantum hardware\, there is\npressing need to d
evelop algorithms\, which can be implemented in present-day NISQ\n(noisy i
ntermediate scale quantum) devices with limited coherence times [3\,4].\nI
n this talk\, we will rst introduce the basics of quantum computing using
super-\nconducting qubits\, focusing on those aspects that are crucial for
the implementation\nof quantum chemistry algorithms. In the second part\,
I will brie\ny discuss the limi-\ntations of currently available classica
l approaches and highlight the advantages of the\nnew generation of quantu
m algorithms for the solution of many-electron problems\nin the ground and
excited states [5].\n[1] B.P. Lanyon et al.\, Nature Chem. 2\, 106 (2010)
.\n[2] N. Moll\, et al.\, Quantum Sci. Technol. 3\, 030503 (2018).\n[3] A.
Kandala et al.\, Nature\, 549\, 242 (2017).\n[4] P. Baroutsos\, et al.\,
Phys. Rev. A\, 98 022322 (2018).\n[5] M. Ganzhorn\,\, et al.\, Phys. Rev.
Appl.\, 11 044092 (2019).\n\nhttps://agenda.infn.it/event/17130/contributi
ons/106936/
LOCATION:Salone degli Affreschi\, Palazzo Ateneo Università "Aldo Moro" B
ari
URL:https://agenda.infn.it/event/17130/contributions/106936/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice QCD on modern GPU systems
DTSTART;VALUE=DATE-TIME:20191212T103000Z
DTEND;VALUE=DATE-TIME:20191212T110000Z
DTSTAMP;VALUE=DATE-TIME:20200921T070757Z
UID:indico-contribution-17130-106939@agenda.infn.it
DESCRIPTION:Speakers: Mathias Wagner (Nvidia Corporation)\nLattice QCD on
modern GPU systems\n\nhttps://agenda.infn.it/event/17130/contributions/106
939/
LOCATION:Salone degli Affreschi\, Palazzo Ateneo Università "Aldo Moro" B
ari
URL:https://agenda.infn.it/event/17130/contributions/106939/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quantum simulation of parton physics
DTSTART;VALUE=DATE-TIME:20191212T113000Z
DTEND;VALUE=DATE-TIME:20191212T120000Z
DTSTAMP;VALUE=DATE-TIME:20200921T070757Z
UID:indico-contribution-17130-106938@agenda.infn.it
DESCRIPTION:Speakers: Yukari Yamauchi (University of Maryland)\nReal-time
correlators are difficult to evaluate on a classical computer due to the s
ign problem. Simulations performed on a quantum computer naturally give re
al-time correlators. From these real-time correlators\, both parton distri
bution functions and the hadronic tensor may be obtained. In this talk\, I
describe three ingredients for the evaluation of the hadronic tensor on a
quantum computer - the preparation of a proton state\, representation and
simulation of SU(3) gauge theory\, and evaluation of real-time correlator
s.\n\nhttps://agenda.infn.it/event/17130/contributions/106938/
LOCATION:Salone degli Affreschi\, Palazzo Ateneo Università "Aldo Moro" B
ari
URL:https://agenda.infn.it/event/17130/contributions/106938/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quantum Computation of Thermal Averages in the Presence of a Sign
Problem
DTSTART;VALUE=DATE-TIME:20191212T121500Z
DTEND;VALUE=DATE-TIME:20191212T123000Z
DTSTAMP;VALUE=DATE-TIME:20200921T070757Z
UID:indico-contribution-17130-106937@agenda.infn.it
DESCRIPTION:Speakers: Giuseppe Clemente (PI)\nWe illustrate the applicatio
n of Quantum Computing techniques to the investigation\nof the thermodynam
ical properties of a simple system\, made up of three\n quantum spins with
frustrated pair interactions and affected by a hard sign problem\nwhen tr
eated within classical computational schemes.\nWe show how quantum algorit
hms completely solve the problem\, and discuss how \nthis can apply to mor
e complex system of physical interest.\n\nhttps://agenda.infn.it/event/171
30/contributions/106937/
LOCATION:Salone degli Affreschi\, Palazzo Ateneo Università "Aldo Moro" B
ari
URL:https://agenda.infn.it/event/17130/contributions/106937/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice Calculations for Muon g-2
DTSTART;VALUE=DATE-TIME:20191212T083000Z
DTEND;VALUE=DATE-TIME:20191212T090000Z
DTSTAMP;VALUE=DATE-TIME:20200921T070757Z
UID:indico-contribution-17130-106934@agenda.infn.it
DESCRIPTION:Speakers: Vera Guelpers (University of Edinburgh)\nOne of the
most promising quantities for the search of signatures of physics beyond t
he Standard Model is the anomalous magnetic moment g-2 of the muon\, where
a comparison of the experimental result with the Standard Model estimate
yields a deviation of about 3.5 sigma. On the theory side\, the largest un
certainty arises from the hadronic sector\, namely the hadronic vacuum pol
arisation and the hadronic light-by-light scattering. I will review recent
progress in calculating the hadronic contributions to the muon g-2 from t
he lattice and discuss the prospects and challenges to match the precision
of the upcoming experiments.\n\nhttps://agenda.infn.it/event/17130/contri
butions/106934/
LOCATION:Salone degli Affreschi\, Palazzo Ateneo Università "Aldo Moro" B
ari
URL:https://agenda.infn.it/event/17130/contributions/106934/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The phase diagram of QCD: some reasons for optimism
DTSTART;VALUE=DATE-TIME:20191212T080000Z
DTEND;VALUE=DATE-TIME:20191212T083000Z
DTSTAMP;VALUE=DATE-TIME:20200921T070757Z
UID:indico-contribution-17130-106933@agenda.infn.it
DESCRIPTION:Speakers: Philippe de Forcrand (ETH Zurich &\; CERN)\nThe d
etermination of the phase diagram of QCD as a function of temperature and
chemical potential via lattice simulations remains a challenge. This is be
cause\nof the "sign problem" at non-zero matter density. I want to highlig
ht some\nrecent progress\, both technical and analytical\, which may bring
reliable\nanswers soon.\n\nhttps://agenda.infn.it/event/17130/contributio
ns/106933/
LOCATION:Salone degli Affreschi\, Palazzo Ateneo Università "Aldo Moro" B
ari
URL:https://agenda.infn.it/event/17130/contributions/106933/
END:VEVENT
BEGIN:VEVENT
SUMMARY:New DoS techniques for finite density lattice QCD
DTSTART;VALUE=DATE-TIME:20191212T090000Z
DTEND;VALUE=DATE-TIME:20191212T093000Z
DTSTAMP;VALUE=DATE-TIME:20200921T070757Z
UID:indico-contribution-17130-106932@agenda.infn.it
DESCRIPTION:Speakers: Christof Gattringer (University of Graz)\nWe discuss
two implementations of the recently developed density of states functiona
l fit approach (DoS FFA) to lattice QCD at finite density. Both implementa
tions are based on suitable pseudo-fermion representations of lattice QCD.
The first approach identifies the imaginary part of the pseudo-fermion ac
tion in the grand-canonical picture and treats it with a direct applicatio
n of DoS FFA. The second approach is based on the canonical formulation wh
ere physics at fixed net-quark number may be obtained with Fourier transfo
rmation with respect to imaginary chemical potential. The imaginary chemic
al potential is treated as an additional degree of freedom and DoS FFA is
used to compute the corresponding density. The two formulations are discu
ssed in detail and we present first tests.\n\nhttps://agenda.infn.it/event
/17130/contributions/106932/
LOCATION:Salone degli Affreschi\, Palazzo Ateneo Università "Aldo Moro" B
ari
URL:https://agenda.infn.it/event/17130/contributions/106932/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quark flavour physics. Status and perspectives
DTSTART;VALUE=DATE-TIME:20191212T093000Z
DTEND;VALUE=DATE-TIME:20191212T100000Z
DTSTAMP;VALUE=DATE-TIME:20200921T070757Z
UID:indico-contribution-17130-106931@agenda.infn.it
DESCRIPTION:Speakers: Marco Ciuchini (ROMA3)\nThe present status of quark
flavour physics\, both in the Delta F=1 and Delta F=2 sectors\, is reviewe
d. Possible theoretical implications of present experimental data are disc
ussed and the impact of future experiments is assessed for some observable
s of interest.\n\nhttps://agenda.infn.it/event/17130/contributions/106931/
LOCATION:Salone degli Affreschi\, Palazzo Ateneo Università "Aldo Moro" B
ari
URL:https://agenda.infn.it/event/17130/contributions/106931/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Spontaneous vs. stimulated brain activity: A statistical physics a
pproach
DTSTART;VALUE=DATE-TIME:20191211T154500Z
DTEND;VALUE=DATE-TIME:20191211T161500Z
DTSTAMP;VALUE=DATE-TIME:20200921T070757Z
UID:indico-contribution-17130-106927@agenda.infn.it
DESCRIPTION:Speakers: Lucilla De Arcangelis (SA)\nThe understanding of the
fundamental relation between electrophysiological activity and brain orga
nization with respect to performing even simple tasks is a long-standing f
ascinating question. The ability of the brain to self-organize information
processing in an efficient way is a crucial ingredient in biologically pl
ausible models. Recent experiments have shown that the spontaneous brain a
ctivity is characterized by burst activity\, i.e. avalanches showing absen
ce of characteristic size\, successfully interpreted in the context of cri
ticality. We introduce a model inspired in self-organized criticality and
reproducing the statistical properties of spontaneous activity\, to study
multitask learning by the implementation of adaptation mechanism inspired
in neurobiology. The system is able to learn all the tested Boolean rules\
, as well as to recognize patterns with a good performance. Finally\, the
fundamental open question of the relation between spontaneous and evoked a
ctivity is addressed by means of the coarse-grained Wilson Cowan model. An
approach inspired in non-equilibrium statistical physics allows to derive
a fluctuation-dissipation relation\, suggesting that measurements of the
spontaneous fluctuations in the global brain activity alone could provide
a prediction for the system response to a stimulus. Theoretical prediction
s are in good agreement with MEG data for healthy patients performing visu
al tasks.\n\nhttps://agenda.infn.it/event/17130/contributions/106927/
LOCATION:Salone degli Affreschi\, Palazzo Ateneo Università "Aldo Moro" B
ari
URL:https://agenda.infn.it/event/17130/contributions/106927/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A chiral three-body force for realistic nuclear shell model calcul
ations
DTSTART;VALUE=DATE-TIME:20191211T164500Z
DTEND;VALUE=DATE-TIME:20191211T170000Z
DTSTAMP;VALUE=DATE-TIME:20200921T070757Z
UID:indico-contribution-17130-106930@agenda.infn.it
DESCRIPTION:Speakers: Giovanni De Gregorio (NA)\nIn the recent years\, the
use of the forces derived from the EFT has grown exponentially. The chira
l two-nucleon forces have been used in many microscopic calculations of nu
clear reactions and structure. In some cases they have been complemented b
y the chiral three-nucleon forces very succesfully applications to few-nuc
leon reactions\, structure of light-and medium-mass nuclei\, and nuclear a
nd neutron matter. However\, its inclusion in heavier systems is very chal
lenging due to the rapid increase in the number of involved matrix element
s along with the growing number of nucleons. Therefore\, HPC codes and res
ources are badly needed.\nWe have implemented the chiral 3N force up to N2
LO [1] in realistic shell model calculations. This 3N potential at N2LO co
nsists of three components\, the two-pion term\, the one-pion term and the
contact term. This 3N force\, together with the chiral 2N component\, is
used for deriving effective Hamiltonians for Shell Model calculations by r
esorting to the Kuo-Lee-Ratcliff folded-diagram expansion [2]. This approa
ch is based on a perturbative expansion of the vertex function called Qbox
(for details see ref. [3]).\nShell-model calculations using this effectiv
e Hamiltonian were performed for nuclei belonging to the p shell [1]\, wit
h the aim of making a benchmark with the ab initio no-core shell model res
ults. Having obtained satisfactory results\, we moved to heavier systems\,
up to fp shell nuclei [4]\, to reproduce the experimental shell evolution
towards and beyond the closure at N = 28. We plan to go beyond this mass
region\, and\, in order to do that\, we need to improve the performances o
f our three body code whose HPC properties will be also discussed.\n\n\n1.
T. Fukui\, L. De Angelis\, Y. Z. Ma\, L. Coraggio\, A. Gargano\, N. Itaco
\, and F. R. Xu Phys. Rev. C 98\, 044305 (2018).\n2. T. T. S. Kuo and E. O
snes\, Lecture Notes in Physics (Springer- Verlag\, Berlin\, 1990)\, Vol.
364.\n3. K. Suzuki and S. Y. Lee\, Prog. Theor. Phys. 64\, 2091 (1980).\n4
. Y. Z. Ma\, L. Coraggio\, L. De Angelis\, T. Fukui\, A. Gargano\, N. Itac
o\, and F. R. Xu\, Phys. Rev. C\, 100\, 034324 (2019).\n\nhttps://agenda.i
nfn.it/event/17130/contributions/106930/
LOCATION:Salone degli Affreschi\, Palazzo Ateneo Università "Aldo Moro" B
ari
URL:https://agenda.infn.it/event/17130/contributions/106930/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Calculation of ${}^6$Li ground state within the Hyperspherical Har
monic basis
DTSTART;VALUE=DATE-TIME:20191211T163000Z
DTEND;VALUE=DATE-TIME:20191211T164500Z
DTSTAMP;VALUE=DATE-TIME:20200921T070757Z
UID:indico-contribution-17130-106928@agenda.infn.it
DESCRIPTION:Speakers: Alex Gnech (Gran Sasso Science Institute)\nThe so ca
lled *ab-initio* methods in nuclear physics permits to solve the full $A$-
body Hamiltonian considering realistic potentials. Among the various *ab-i
nitio* approaches\, the Hypespherical Harmonic(HH) method has been success
fully applied in studying bound states and low-energy scattering process o
f $A=3$ and $A=4$ system [1]. The extension of the HH method to $A\\geq5$
results to be limited by the large amount of states needed for constructin
g the Hamiltonian matrix element up to convergence. However\, the use of t
he brute force parallelization combined with some new computational approa
ch opens the door to use it for larger systems. In this Talk we will intro
duce the computational solutions used to construct the HH basis and the po
tential matrix elements in systems larger than $A=4$. Then we will present
\, as first results of this new computational approach\, the calculation o
f the $^6\\text{Li}$ wave function discussing also its electromagnetic str
ucture and the $\\alpha+d$ clusterization.\n\n[1] A. Kievsky\, S. Rosati\,
M. Viviani\, L.E. Marcucci\, and L. Girlanda\, J. Phys. G: Nucl. Part. Ph
ys. **35**\, 063101 (2008)\n\nhttps://agenda.infn.it/event/17130/contribut
ions/106928/
LOCATION:Salone degli Affreschi\, Palazzo Ateneo Università "Aldo Moro" B
ari
URL:https://agenda.infn.it/event/17130/contributions/106928/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Skyrmions and rho mesons\, a numerically demanding relationship fo
r nuclei
DTSTART;VALUE=DATE-TIME:20191211T161500Z
DTEND;VALUE=DATE-TIME:20191211T163000Z
DTSTAMP;VALUE=DATE-TIME:20200921T070757Z
UID:indico-contribution-17130-106926@agenda.infn.it
DESCRIPTION:Speakers: Carlos Naya (Istituto Nazionale di Fisica Nucleare)\
nThe Skyrme model is a low energy effective field theory of strong interac
tions where nuclei and baryons appear as topological solitons\, more concr
etely as collective excitations of pionic degrees of freedom. Proposed by
Tony Skyrme in the sixties\, his ideas received further support when it wa
s discovered that in the limit of the large number of colours of QCD\, an
effective theory of mesons arises. In the last years\, there has been a re
vival of Skyrme's ideas and new related models have been proposed to overc
ome two of the main drawbacks of the theory\, namely\, the too large bindi
ng energies and the lack of cluster structures. The aim of this talk is to
successfully address both issues at the same time\, something that has no
t been done before\, by extending the standard Skyrme model with the inclu
sion of the rho meson\, via dimensional deconstruction of pure Yang-Mills
theory in one higher dimension. The complexity of the resulting energy fun
ctional makes the use of HPC resources mandatory to successfully deliver t
his task.\n\nhttps://agenda.infn.it/event/17130/contributions/106926/
LOCATION:Salone degli Affreschi\, Palazzo Ateneo Università "Aldo Moro" B
ari
URL:https://agenda.infn.it/event/17130/contributions/106926/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Phase behavior and topological defects of active Brownian particle
s in two dimensions
DTSTART;VALUE=DATE-TIME:20191211T171500Z
DTEND;VALUE=DATE-TIME:20191211T173000Z
DTSTAMP;VALUE=DATE-TIME:20200921T070757Z
UID:indico-contribution-17130-106925@agenda.infn.it
DESCRIPTION:Speakers: Pasquale Digregorio (Università degli Studi di Bari
and INFN - Sezione di Bari)\nFrom large-scale Molecular Dynamics simulati
ons\, we performed a complete analysis of local hexatic parameter\, local
density ad out-of-equilibrium equation of state of self-propelled hard dis
ks in two spatial dimensions. We established the complete phase diagram of
the model. The equilibrium melting follows a mixed scenario with first-or
der liquid-hexatic transition and BKT hexatic-solid one. This scenario is
maintained at small activities\, with coexistence between active liquid an
d hexatic order. As activity increases\, the emergence of hexatic and soli
d order is shifted towards higher densities. Above a critical activity and
for a certain range of packing fractions\, the system undergoes motility-
induced phase separation and demixes into low and high density phases\; th
e latter can be either disordered (liquid) or ordered (hexatic or solid) d
epending on the activity [1].\n\nWe also provide a quantitative analysis o
f all kinds of topological defects present in 2D passive and active repuls
ive disk systems. We show that the solid-hexatic melting is driven by the
unbinding of dislocations\, and dissociation of disclinations is present a
s soon as the liquid phase appears. These two processes are in agreement w
ith the two defects-unbinding mechanisms predicted within the Halperin-Nel
son theory of melting. Concerning the hexatic-liquid melting\, we observe
on top that extended clusters of defects largely dominate over the point d
efects. Such defect clusters percolate at the hexatic-liquid transition in
continuous cases or within the coexistence region in discontinuous ones\,
and their form gets more ramified for increasing activity [2].\n\n[1] PD\
, D. Levis\, A. Suma\, L.F. Cugliandolo\, G. Gonnella\, I. Pagonabarraga.
**Full Phase Diagram of Active Brownian Disks: From Melting to Motility-In
duced Phase Separation**. Phys. Rev. Lett.\, 121\, (2018).\n\n[2] PD\, D.
Levis\, L.F. Cugliandolo\, G. Gonnella\, I. Pagonabarraga. **Clustering of
topological defects in two-dimensional melting of active and passive disk
s**. arXiv:1911.06366 (2019).\n\nhttps://agenda.infn.it/event/17130/contri
butions/106925/
LOCATION:Salone degli Affreschi\, Palazzo Ateneo Università "Aldo Moro" B
ari
URL:https://agenda.infn.it/event/17130/contributions/106925/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Multi-scale molecular dynamics & first-principle calculations of X
-ray absorption spectra: the coordination of metal cations with water e b
iomolecules.
DTSTART;VALUE=DATE-TIME:20191211T143000Z
DTEND;VALUE=DATE-TIME:20191211T144500Z
DTSTAMP;VALUE=DATE-TIME:20200921T070757Z
UID:indico-contribution-17130-106923@agenda.infn.it
DESCRIPTION:Speakers: Francesco Stellato (ROMA2)\nThe progress in high per
formance computing we are witnessing today offers the possibility of accur
ate ab initio calculations of structures of systems in realistic physico-c
hemical conditions. In this talk we present a parameter-free strategy aime
d at performing a first-principle computation of the low energy part of th
e X-ray Absorption Spectroscopy (XAS) spectrum\, based on density function
al theory (DFT). \nThe starting model system configurations are built by m
eans of classical molecular dynamics simulations calculations of metal-wat
er complexes. Then\, DFT is exploited to relax the resulting metal-water g
eometrical structures. Finally the XAS spectra associated to the resulting
structures are calculated. \nAs first applications we determined the coor
dination mode of divalent metal cations in water\, showing that Cu(II) and
Zn(II) ions have different coordination modes. Here we will show prelimin
ary results obtained in the more interesting - and much more computational
ly expensive - case in which metal ions are in complex with molecules of b
iological relevance\, such as the amyloid beta peptides involved in the pa
thogenesis of Alzheimer’s disease.\n\nhttps://agenda.infn.it/event/17130
/contributions/106923/
LOCATION:Salone degli Affreschi\, Palazzo Ateneo Università "Aldo Moro" B
ari
URL:https://agenda.infn.it/event/17130/contributions/106923/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Grand canonical ensemble of heterogeneous weighted networks
DTSTART;VALUE=DATE-TIME:20191211T134500Z
DTEND;VALUE=DATE-TIME:20191211T141500Z
DTSTAMP;VALUE=DATE-TIME:20200921T070757Z
UID:indico-contribution-17130-106921@agenda.infn.it
DESCRIPTION:Speakers: Andrea Gabrielli (Dipartimento di Ingegneria\, Unive
rsità degli Studi Roma Tre)\nIn the last years the formulation of statist
ical ensembles of binary and weighted random graphs satisfying some arbitr
ary constraints has attracted much attention in phys/math communities for
its two-fold potential application [1\, 2]: (i) The construction of approp
riate null models for the statistical validation of high order properties
of real networks\; (ii) the reconstruction of the statistical properties o
f real network starting for partial accessible information. The cornerston
e of the statistical physics of complex networks is the idea that the link
s\, and not the nodes\, are the effective particles of the system. Here we
formulate a mapping between weighted networks and lattice gasses\, making
the conceptual step forward of interpreting weighted links as particles w
ith a generalised coordinate [3]. This leads to the definition of the gran
d canonical ensemble of weighted complex networks. We derive exact express
ions for the partition function and thermodynamic quantities\, both in the
cases of global and local (i.e.\, node-specific) constraints on density a
nd mean energy of particles. We further show that\, when modeling real cas
es of networks\, the binary and weighted statistics of the ensemble can be
disentangled\, leading to a simplified framework for a range of practical
applications.\n\nReferences \n[1] T. Squartini\, G. Caldarelli\, G. Cimin
i\, A. Gabrielli\, D\, Garlaschelli\, Phys. Reports **757**\, 1-47 (2018).
\n[2] G. Cimini\, T. Squartini\, F. Saracco\, D. Garlaschelli\, A. Gabrie
lli\, G. Caldarelli\, Nature Review Physics **1**\, 58-71 (2019). \n[3] A.
Gabrielli\, R. Mastrandrea\, G. Caldarelli\, G. Cimini\, Phys. Rev. E **9
9**\, 030301(R) (2019)\n\nhttps://agenda.infn.it/event/17130/contributions
/106921/
LOCATION:Salone degli Affreschi\, Palazzo Ateneo Università "Aldo Moro" B
ari
URL:https://agenda.infn.it/event/17130/contributions/106921/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Social anatomy of a financial bubble
DTSTART;VALUE=DATE-TIME:20191211T131500Z
DTEND;VALUE=DATE-TIME:20191211T134500Z
DTSTAMP;VALUE=DATE-TIME:20200921T070757Z
UID:indico-contribution-17130-106920@agenda.infn.it
DESCRIPTION:Speakers: Rosario Nunzio Mantegna (University of Palermo)\nThi
s work is about the demographic trends and social dynamics observed at the
onset and during the evolution of a financial bubble. Our characterizatio
n aims to detect demographic trends in the flux of new investors buying th
e Nokia asset\, i.e. the most representative dotcom stock of the Nordic St
ock Exchange during the dotcom bubble. The data for our empirical investig
ation are taken from two datasets. The first one is maintained by Euroclea
r\, and it tracks the daily ownership of financial assets owned by Finnish
investors during the period 1995-2003. The second dataset has demographic
information collected by the national statistics office of Finland about
age categories\, number of inhabitants\, income levels\, education and job
s per postal code of residence. We track the flux of new investors enterin
g the market daily\, and we yearly compare their demographic features with
those of the whole Finnish population with a method able to detect over-e
xpression and under-expression of attributes in a heterogeneous system [1]
. As for many innovation product or services\, we detect a bursty dynamics
of access to the market by new investors. We investigate the attributes o
f age\, postal code and gender\, of new Nokia investors. As far as income
levels and job information are concerned\, these attributes are first assi
gned through maximum entropy methods using age levels as a conditioning va
riable. We also present an agent based model which is a variant of Deffuan
t’s opinion model [2]\, that can qualitatively describe the bursty profi
le of access to the market of new investors.\n\n[1] Tumminello\, M.\, Micc
ichè\, S.\, Lillo\, F.\, Varho\, J.\, Piilo\, J. and Mantegna\, R.N.\, 20
11. Community characterization of heterogeneous complex systems. Journal o
f Statistical Mechanics: Theory and Experiment\, 2011(01)\, p.P01019.\n[2]
Deffuant\, G.\, Neau\, D.\, Amblard\, F. and Weisbuch\, G.\, 2000. Mixing
beliefs among interacting agents. Advances in Complex Systems\, 3(01n04)\
, pp.87-98.\n\nJoint work with Federico Musciotto (ETH\, Zhurich) and Jyrk
i Piilo (University of Turku\, Finland)\n\nhttps://agenda.infn.it/event/17
130/contributions/106920/
LOCATION:Salone degli Affreschi\, Palazzo Ateneo Università "Aldo Moro" B
ari
URL:https://agenda.infn.it/event/17130/contributions/106920/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Chemical properties emerging from structural disorder in biology
DTSTART;VALUE=DATE-TIME:20191211T141500Z
DTEND;VALUE=DATE-TIME:20191211T143000Z
DTSTAMP;VALUE=DATE-TIME:20200921T070757Z
UID:indico-contribution-17130-106918@agenda.infn.it
DESCRIPTION:Speakers: Giovanni La Penna (R)\nDuring neurodegeneration\, th
e first stage of neuronal death\, abnormal concentrations of structurally
disordered proteins and ions\, like zinc and copper\, are observed in the
synapse. Some proteins\, like amyloid-beta (Abeta) peptides\, form\, in th
e Alzheimer's disease\, oligomers and aggregates that become markers of th
e irreversible pathway towards death. When such conditions occur in the sy
napses\, the chemical species formed by copper and amyloid peptides produc
e levels of radicals comparable with the free copper ions\, thus increasin
g the oxidative stress.\nUsing computational resources offered by the PRAC
E infrastructure\, we have extensively modeled the interactions between co
pper ions and amyloid-beta peptides in a water environment and in contact
with a model synaptic membrane. The models explain why weak Cu-Abeta inter
actions\, specific of amyloid beta peptides\, make copper more aggressive
[1].\nWe simulated about 120 walkers starting from different configuration
s for one to four copper ions in contact with one to four amyloid-beta pep
tides\, on the basis of empirical models. Each of these configurations was
refined with explicit electrons\, thus modeling the details of the copper
-peptide interactions for all the configurations at the same time. Thousan
ds of computing units can be\nefficiently used at the same time\, to provi
de an approximate statistical view of reactivity.\nThese models open a new
venue for understanding\, at an atomic level\, the role of disordered bio
logical molecules in making the chemistry of reactive centers versatile\,
a general feature of living cells [2].\n\n [1]: http://dx.doi.org/10.1002
/chem.201704654\n [2]: http://dx.doi.org/10.1039/C9CP00293F\n\nhttps://ag
enda.infn.it/event/17130/contributions/106918/
LOCATION:Salone degli Affreschi\, Palazzo Ateneo Università "Aldo Moro" B
ari
URL:https://agenda.infn.it/event/17130/contributions/106918/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Frozen relaxation dynamics in the presence of breathers
DTSTART;VALUE=DATE-TIME:20191211T103000Z
DTEND;VALUE=DATE-TIME:20191211T110000Z
DTSTAMP;VALUE=DATE-TIME:20200921T070757Z
UID:indico-contribution-17130-106915@agenda.infn.it
DESCRIPTION:Speakers: Paolo Politi (FI)\nSlow processes in physics are typ
ically related to the existence of high (free) \nenergy barriers\, which r
equire strong fluctuations\, or to nearly integrable \nregions in the phas
e space\, which determine a slow onset of equipartition. \nIn this talk w
e intend to discuss a different mechanism appearing in the \nDiscrete Nonl
inear Schroedinger Equation (DNLSE)\, when we analyze the relaxation\nof l
arge excitations (breathers). \nRelaxation occurs through a diffusive-type
process and through an activated process:\nthe effectiveness of both mech
anisms decreases exponentially with breather height.\n\nhttps://agenda.inf
n.it/event/17130/contributions/106915/
LOCATION:Salone degli Affreschi\, Palazzo Ateneo Università "Aldo Moro" B
ari
URL:https://agenda.infn.it/event/17130/contributions/106915/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Abelian axial anomaly in 3D semimetals
DTSTART;VALUE=DATE-TIME:20191211T113000Z
DTEND;VALUE=DATE-TIME:20191211T114500Z
DTSTAMP;VALUE=DATE-TIME:20200921T070757Z
UID:indico-contribution-17130-106912@agenda.infn.it
DESCRIPTION:Speakers: Luca Lepori (IIT Genova)\nAfter a general introducti
on on\nDirac and (multi-)Weyl semimetals\,\nI will discuss the abelian axi
al anomaly\nin multi-Weyl and triple-point semimetals\,\ncommenting on its
physical consequences.\n\nReference:\n\nL. Lepori\, M. Burrello\, and E.
Guadagnini\, ”Axial anomaly in\nmulti-Weyl and triple-point semimetals
”\, J. High En. Phys. (2018).\n\nhttps://agenda.infn.it/event/17130/cont
ributions/106912/
LOCATION:Salone degli Affreschi\, Palazzo Ateneo Università "Aldo Moro" B
ari
URL:https://agenda.infn.it/event/17130/contributions/106912/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Current transport properties and phase diagram of a Kitaev chain w
ith long-range pairing
DTSTART;VALUE=DATE-TIME:20191211T110000Z
DTEND;VALUE=DATE-TIME:20191211T111500Z
DTSTAMP;VALUE=DATE-TIME:20200921T070757Z
UID:indico-contribution-17130-106906@agenda.infn.it
DESCRIPTION:Speakers: Domenico Giuliano (CS)\nWe describe a method to prob
e the quantum phase transition between the short-range and the long-range
topological phase in the superconducting Kitaev chain with long-range pair
ing. We show that\, when the leads are biased at a voltage V\, the Fano fa
ctor is either zero or 2e. As a result\, we find that the Fano factor wor
ks as a directly measurable quantity to probe the quantum phase transition
between the two phases\, also showing a remarkable "critical fractionali
zation effect". Finally\, we note that a dual implementation of our propos
ed device makes it suitable as a generator of large-distance entangled two
-particle states.\n\nhttps://agenda.infn.it/event/17130/contributions/1069
06/
LOCATION:Salone degli Affreschi\, Palazzo Ateneo Università "Aldo Moro" B
ari
URL:https://agenda.infn.it/event/17130/contributions/106906/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Going Relativistic with Lattice Boltzmann Methods
DTSTART;VALUE=DATE-TIME:20191211T090000Z
DTEND;VALUE=DATE-TIME:20191211T091500Z
DTSTAMP;VALUE=DATE-TIME:20200921T070757Z
UID:indico-contribution-17130-106908@agenda.infn.it
DESCRIPTION:Speakers: Daniele Simeoni (University of Ferrara)\nThe study o
f relativistic fluids apply to several fields of modern physics\, \ncoveri
ng many different scales\, from astrophysics\, to atomic scales (e.g. in t
he study of effective 2D systems such as graphene) and further down to sub
nuclear scales (e.g. quark-gluon plasmas).\n\nIn particular\, the experime
ntal results from heavy-ion collisions at RHIC and LHC\, with the first ex
perimental observation of the quark-gluon plasma\, have significantly boos
ted in recent years the interest in the study of relativistic fluid dynami
cs\, both at the level of theoretical formulations as well as in the devel
opment of reliable numerical simulation methods.\n\nFor a long time\, rela
tivistic fluid dynamics has been hampered by several theoretical and compu
tational shortcomings\, as relativistic versions of the viscous Navier-Sto
kes equations suffer from causality problems linked to the order of the de
rivatives appearing in the dissipative terms. Some of these problems can b
e avoided by employing a lattice kinetic approach\, that treats space and
time on the same footing (i.e.\, via first-order derivatives). \n\nThis is
one of the main reasons why Relativistic Lattice Boltzmann Methods (RLBMs
)\, that discretize in coordinate and momentum space the Boltzmann equatio
n and yet ensure that the resulting synthetic dynamics retains all its hyd
rodynamic properties\, have been recently proposed as effective computatio
nal tools to study relativistic flows.\n\nSeveral different RLBMs have bee
n proposed in the last decade\, initially limited to the study of ultra-re
lativistic regimes (in which the ratio $\\zeta = \\frac{m c^2}{k_B T}$ goe
s to zero\; $m$ is the mass of the particles in the fluid\, $T$ is tempera
ture and $k_B$ is Boltzmann constant) and more recently extended to cover
a wider range of physics parameters\, going from ultra-relativistic to mil
dly relativistic and eventually to the non-relativistic limit ($\\zeta \\r
ightarrow \\infty$).\n\nThis talk presents an overview of the formal detai
ls needed to develop RLBMs and \nthe available options to derive effective
and robust computational tools\; special focus will be posed on the defin
ition of transport coefficients\, since the correct link of the kinetic le
vel with the macroscopic one has been debated for a long time in the liter
ature. \nFinally\, we present numerical results of standard benchmarks for
the validation of the method in which we compare with other approaches\,
as well as a few examples of applications.\n\nhttps://agenda.infn.it/event
/17130/contributions/106908/
LOCATION:Salone degli Affreschi\, Palazzo Ateneo Università "Aldo Moro" B
ari
URL:https://agenda.infn.it/event/17130/contributions/106908/
END:VEVENT
BEGIN:VEVENT
SUMMARY:INTEREVENT TIME DISTRIBUTION IN AVALANCHE DYNAMICS.
DTSTART;VALUE=DATE-TIME:20191211T083000Z
DTEND;VALUE=DATE-TIME:20191211T090000Z
DTSTAMP;VALUE=DATE-TIME:20200921T070757Z
UID:indico-contribution-17130-106907@agenda.infn.it
DESCRIPTION:Speakers: Roberto Benzi (Dipartimento di Fisica\, Univ. di Rom
a "Tor Vergata")\nPhysical systems characterized by stick-slip dynamics of
ten display avalanches. Regardless of the diversity of their microscopic\n
\nstructure\, these systems are governed by a power-law distribution of av
alanche size and duration. We focus instead on the\n\ninterevent times bet
ween avalanches and show that\, unlike their size and duration\, the distr
ibution of interevent times is able to\n\ndistinguish different mechanical
states of the system\, characterized by different volume fractions or con
fining pressures. We\n\nuse experiments in granular media and numerical si
mulations of emulsions to show that systems having the same probability\n\
ndistribution for avalanche size and duration can have different intereven
t time distributions. Remarkably\, for large packing\n\nratios\, these int
erevent time distributions coincide with those for earthquakes and are ind
irect evidence of large space-time\n\ncorrelations in the system. Our resu
lts therefore indicate that interevent time statistics are more informativ
e to characterize the\n\ndynamics of avalanches.\n\nhttps://agenda.infn.it
/event/17130/contributions/106907/
LOCATION:Salone degli Affreschi\, Palazzo Ateneo Università "Aldo Moro" B
ari
URL:https://agenda.infn.it/event/17130/contributions/106907/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Vortex mass in the three-dimensional O(2) scalar theory
DTSTART;VALUE=DATE-TIME:20191211T094500Z
DTEND;VALUE=DATE-TIME:20191211T100000Z
DTSTAMP;VALUE=DATE-TIME:20200921T070757Z
UID:indico-contribution-17130-106911@agenda.infn.it
DESCRIPTION:Speakers: Gesualdo Delfino (SISSA-Trieste)\nWe study the spont
aneously broken phase of the XY model in three dimensions\, with boundary
conditions enforcing the presence of a vortex line. Comparing field theore
tical and Monte Carlo determinations of the magnetization profile\, we num
erically determine the mass of the vortex particle in the underlying O(2)-
invariant quantum field theory. The result also shows that Derrick's theor
em does not in general pose an obstruction to the existence of stable topo
logical particles in scalar quantum field theories in more than two dimens
ions.\n\nReferences:\n\n[1] G. Delfino\, W. Selke and A. Squarcini\, Phys.
Rev. Lett. 122\, 050602 (2019).\n[2] G. Delfino\, J. Phys. A: Math. Theor
. 47 (2014) 132001.\n\nhttps://agenda.infn.it/event/17130/contributions/10
6911/
LOCATION:Salone degli Affreschi\, Palazzo Ateneo Università "Aldo Moro" B
ari
URL:https://agenda.infn.it/event/17130/contributions/106911/
END:VEVENT
END:VCALENDAR