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SM&FT 2015 - The XVI Workshop on Statistical Mechanics and nonpertubative Field Theory

9–11 Dec 2015
Dipartimento di Fisica, Univ. Bari - INFN Sezione di Bari
Europe/Rome timezone
SM&FT 2015 Computational approaches in Quantum Field Theory, Statistical Mechanics and Complex Systems

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Contribution List

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  1. 45. Pathway-based personalized analysis of cancer
    Prof. Eytan Domany (Weizmann Institute of Science)
    09/12/2015, 14:30
    I will present a “systems approach” to analysis of high throughput large cancer datasets. The basic idea is to make use of existing knowledge, taking the golden path between “ignorance-based” machine learning approaches and the “all details are essential” view of many biologists. This philosophy [1] has been implemented in Pathifier – an algorithm that infers pathway deregulation scores for...
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  2. 35. Time-energy correlations as a hallmark of different branching processes
    Lucilla De Arcangelis (S)
    09/12/2015, 15:10
    Several biological and natural systems appear to operate close to a critical point, as evidenced by the absence of a characteristic size in the phenomenon. Indeed, the existence of power law distributions has been detected in several contexts, as different as earthquakes, solar flares or spontaneous brain activity, and, surprisingly, with similar scaling behaviour. We propose that the specific...
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  3. 8. Plastic events in soft glasses
    Prof. Roberto Benzi (Dipartimento di Fisica, Univ. di Roma "Tor Vergata")
    09/12/2015, 15:40
    Many materials around us respond elastically to small applied stresses, but flow once a threshold stress (the yield stress) is exceeded. This is the case for food products, powders, cosmetics, foams, etc… It turns out that understanding the yield stress transition in these materials, often called soft glasses, is a challenging question. Similar to structural glasses, soft glasses exhibit aging...
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  4. 11. Heterogenous mean field approach to neural networks dynamics
    Dr Alessandro Vezzani (CNR NANO)
    09/12/2015, 16:10
    We apply to neural networks dynamics on on random massive networks the hetherogeneous mean field approach which has been originally developed for epidemic and social systems. In particular we focus on leaky integrate-and-fire neurons with short-term plasticity evidencing that for large enough connectivity the method provides a good descriptoin of the full network dynamics. Then we analyze in...
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  5. 32. The role of metals in the Alzheimer disease. Experiments and ab initio simulations
    Prof. silvia morante (department of physics University of Rome Tor Vergata)
    09/12/2015, 17:00
    The simultaneous development of new algorithms and powerful computers together with more and more advanced experimental techniques, is opening a new era where numerical and experimental approaches will be synergistically employed to make us understanding phenomena until recently unattainable. I will highlight the importance of the complementary use of experiments and numerical approaches in...
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  6. 40. The INFN SUMA Project
    Raffaele Tripiccione (FE)
    09/12/2015, 17:30
    The INFN-SUMA project started in early 2013 and is expected to reach its end of life later this year. The main goal of this project is to support those theoretical studies at INFN that need state-of-the-art computing systems and advanced computing techniques. In this talk I plan to review the main areas of the project, quickly providing pointers to the main physics results made possible by...
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  7. 44. Early indicators of abrupt desertification transitions
    Prof. Cecilia Pennetta (Università del Salento)
    09/12/2015, 18:00
    Regime shifts in ecosystems can imply relevant economic and social effects. This is especially true when they involve abrupt transitions occurring on a relatively short timescale [1-2]. A special case of regime shift is given by desertification transitions of semi-arid ecosystems which can be strongly affected by climatic or anthropogenic factors [1-3]. A crucial issue in this field concerns...
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  8. 9. Spontaneous knotting of DNA and other biomolecules: dynamical and functional aspects.
    Prof. Cristian Micheletti (SISSA)
    09/12/2015, 18:30
    By using both coarse-grained models and bioinformatics approaches, we shall address a few prototypical examples of the intriguing implications of entanglement and knotting on the functional, mechanical and folding properties of various types of biomolecules. In particular, we shall discuss the kinetics of spontaneous knotting of long ssDNA chains and examine the "topological friction"...
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  9. 5. Network geometry
    Dr Ginestra Bianconi (Queen Mary University of London)
    10/12/2015, 09:00
    Networks are mathematical structures that are universally used to describe a large variety of complex systems such as the brain or the Internet. Characterizing the geometrical properties of these networks has become increasingly relevant for routing problems, inference and data mining. In real growing networks, topological, structural and geometrical properties emerge spontaneously from their...
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  10. 13. The meson spectrum in large N QCD
    Prof. Gunnar Bali (University of Regensburg)
    10/12/2015, 09:40
    We compute the continuum limit of meson masses, the pion decay constant and the chiral condensate in lattice similations with different numbers of colours N and extrapolate these to the limit of large N.
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  11. 39. Flux tubes at finite temperature
    Francesca Cuteri (CS)
    10/12/2015, 10:20
    An attempt to adapt the study of color flux tubes to the case of finite temperature has been made. The field is measured both through the correlator of two Polyakov loops, one of which connected to a plaquette, and through a connected correlator of Wilson loop and plaquette in the spatial sublattice. Still the profile of the flux tube resembles the transverse field distribution around an...
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  12. 4. Superfluids of charged mesons
    Massimo Mannarelli (LNGS)
    10/12/2015, 10:40
    We present various results regarding the chemical potential driven meson condensation. A system of mesons at vanishing temperature can undergo a phase transition to various superfluid phases by varying the isospin chemical potential and/or the strange quark chemical potential. In the condensed phase one of the charged mesons becomes the superfluid mode, the mesons are mixed and their masses...
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  13. 38. Progress toward QCD at non-zero matter density
    Mr Philippe de Forcrand (ETH Zurich & CERN)
    10/12/2015, 11:30
    Determining the phase diagram of QCD, as a function of the density of matter and the temperature, could be accomplished by lattice Monte Carlo simulations, if it were not for a severe "sign problem". I present one promising approach to circumvent this obstacle, based on reversing the usual order of integration and integrating the gauge fields first.
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  14. 31. Curvature of the pseudocritical line in (2+1)-flavor QCD
    Alessandro Papa (CS)
    10/12/2015, 12:10
    We study QCD with (2 + 1) HISQ fermions at nonzero temperature and nonzero imaginary baryon chemical potential. Monte Carlo simulations are performed using the MILC code along the line of constant physics with a light to strange mass ratio of ml/ms=1/20 on lattices up to 48^3x12 to check for finite cutoff effects. We determine the curvature of the pseudocritical line extrapolated to the...
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  15. 18. The pseudocritical line in QCD at nonvanishing chemical potential
    Michele Mesiti (PI)
    10/12/2015, 12:40
    We present a determination of the curvature of the pseudo-critical line in Nf=2+1 QCD at the physical point, performed using the analytic continuation approach. We extrapolate the results towards the continuum limit by considering four different lattice spacings and studying the possible systematics involved.
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  16. 48. Tetraquarks, pentaquarks and the like: old and new views
    Giancarlo Rossi (ROMA2)
    10/12/2015, 14:30
    In this talk, after a short introduction on the history of the discovery of unusually narrow, massive resonances, I will present a QCD interpretation of this new set of mesonic and baryonic hadrons as tetraquark and pentaquark states, respectively.
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  17. 16. New Metrics for Economic Complexity: Measuring the Intangible Growth Potential of Countries
    Prof. Luciano Pietronero (University of Rome Sapienza and Institute of Complex Systems, ISC-CNR)
    10/12/2015, 15:00
    Economic Complexity refers to a new line of research which portrays economic growth as a process of evolution of ecosystems of technologies and industrial capabilities. Complex systems analysis, simulation, systems science methods, and big data capabilities offer new opportunities to empirically map technology and capability ecosystems of countries, industrial sectors and companies, analyse...
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  18. 36. Fully automated clustering by accurate non-parametric density estimation
    Dr Maria d'Errico (SISSA)
    10/12/2015, 15:40
    The use of the right density estimates in the framework of density-based cluster analysis is one of the keys to reveal the properties of a given dataset. We developed a new unsupervised and adaptive density estimator [1], that is able to reconstruct the point local density in an accurate way, even in highly inhomogeneous datasets. By combining the new density estimator with a generalized...
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  19. 6. Kuramoto model of synchronization: equilibrium and nonequilibrium aspects
    Stefano Ruffo (FI)
    10/12/2015, 16:00
    Recently, there has been considerable interest in the study of spontaneous synchronization, particularly within the framework of the Kuramoto model. The model comprises oscillators with distributed natural frequencies interacting through a mean-field coupling, and serves as a paradigm to study synchronization. In this talk, I will describe the model from a different point of view, emphasizing...
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  20. 43. Implications of Poincare' symmetry for thermal field theories
    Leonardo Giusti (MIB)
    10/12/2015, 17:00
    The canonical partition function of a thermal system expressed in a moving frame has a natural implementation in the Euclidean path-integral formulation in terms of shifted boundary conditions. The Poincare' invariance underlying a relativistic theory implies a set of Ward identities among the correlators of the energy-momentum tensor which have also interesting applications in lattice...
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  21. 33. Duals of lattice QCD in the presence of dynamical fermions
    Oleg Borisenko (Bogolyubov Institute for Theoretical Physics, Academy of Sciences of Ukraine)
    10/12/2015, 17:30
    A various approaches to construction of dual formulations of non-abelian lattice gauge theories are reviewed. The conventional approach based on the character expansion is elaborated for SU(2) LGT with the staggered fermions. In the case of U(N) LGT we use the theory of the Weingarten functions to construct a dual formulation. Possible applications related to the finite-density QCD are discussed.
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  22. 12. Long Range Force and Y-Bosonic strings in Baryons
    Dr Ahmed Bakry (Institute of Modern Physics,CAS)
    10/12/2015, 18:00
    The potential due to system of a three static quark (3Q) is studied using SU(3) lattice QCD at finite T. The (3Q) potential is calculated in pure SU(3) Yang-Mills latice gauge theory at finite temperature with Polyakov loops operators. In this work, we focus on the relation between the parameterization ansatz of the (3Q) potential and the observed form of the strings in the baryon. The...
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  23. 29. On the width of the confining flux tube in the 3D U(1) lattice gauge theory
    Davide Vadacchino (TO)
    10/12/2015, 18:20
    A great deal of information about the confining regime of gauge theories can be obtained from the dynamics of the flux tube connecting two opposite chromoelectric charges. Specifically, from the behaviour of its squared width at increasing intercharge distance, which, in an effective string theory approach, is predicted to be logarithmic. This prediction has been confirmed numerically in...
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  24. 47. Turbulence on a Fractal Fourier set
    Alessandra S. Lanotte (LE)
    11/12/2015, 09:00
    The dynamical effects of mode reduction in Fourier space for three dimensional turbulent flows is studied. We present fully resolved numerical simulations of the Navier-Stokes equations with Fourier modes constrained to live on a fractal set of dimension D. The robustness of the energy cascade and vortex stretching mechanisms are tested at changing D, from the standard three dimensional...
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  25. 14. Active dumbbells: from diffusion properties to aggregation phenomena
    Dr Alessandro Mossa (FI)
    11/12/2015, 09:20
    In the last two decades active matter has been the object of a surge of theoretical and experimental interest. Apart from the obvious biological relevance, theorists are also specially attracted by the inherently non-equilibrium nature of self-propulsion phenomena. After a quick overview of the theoretical models and experimental systems that are currently under the spotlight, this talk will...
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  26. 28. Quench Dynamics in Two-Dimensional Integrable SUSY Models
    Axel Cortes Cubero (T)
    11/12/2015, 09:40
    We analyse quench processes in two dimensional quantum field theories with infinite number of conservation laws which also include fermionic charges that close a $N=1$ supersymmetric algebra. While in general the quench protocol induces a breaking of supersymmetry, we show that there are particular initial states which ensure the persistence of supersymmetry also for the dynamics out of...
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  27. 34. Infinite order phase transitions in two-dimensional U(N) and SU(N) spin models.
    Volodymyr Chelnokov (Bogolyubov Institute for Theoretical Physics of the National Academy of Sciences of Ukraine)
    11/12/2015, 10:00
    Two dimensional U(N) and SU(N) spin models are studied both analytically and numerically to establish the existence of BKT-like phase transitions. In U(N) case a BKT phase transition is found for any value of N. In SU(N) case two BKT-like transitions appear in the model with an adjoint interaction term, if it is large enough, though in the model without the adjoint term only a first order...
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  28. 30. Hagedorn spectrum in pure Yang-Mills theories on the lattice
    Alessandro Nada (TO)
    11/12/2015, 10:20
    We present a novel set of high-precision lattice results for the equation of state of the SU(2) pure Yang-Mills theory in the confining phase. The prediction of a gas of non-interacting, massive glueballs yields a remarkable description of lattice data, provided that a bosonic closed string model is used to derive an exponentially growing Hagedorn spectrum for heavy glueball states. This...
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  29. 3. Thermal fluctuations in a kinetic model for multicomponent fluids
    Dr Daniele Belardinelli (Università di Roma, Tor Vergata)
    11/12/2015, 10:40
    Thermal fluctuations and non-ideal multicomponent effects are important ingredients for a proper mesoscale description of a wide variety of flows in soft matter and biological physics [1, 2, 3]. Theoretically, thermally fluctuating mesoscopic flows are most conveniently dealt within the framework of fluctuating hydrodynamics [4]. An important ingredient in this formulation is the...
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  30. 19. Real-time simulation of large open quantum spin systems driven by dissipation
    Prof. Uwe-Jens Wiese (Bern University)
    11/12/2015, 11:30
    The real-time evolution of large open quantum spin systems, whose dynamics are entirely driven by dissipative couplings to an environment, is studied in two and three spatial dimensions. Dissipative processes with Hermitean quantum jump operators lead from the ordered phase of the Heisenberg or XY-model into a disordered phase at late times. The corresponding Lindblad equation is solved using...
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  31. 10. The electric dance of cholesteric colloids
    Enzo Orlandini (P)
    11/12/2015, 12:10
    Dispersions of colloidal particles in liquid crystals are nowadays a subject of intensive studies due to their potential as novel and versatile metamaterials with important applicative avenues such as digital-ink technologies, biosensors and optical devices. In this talk I will report theoretical results, based on lattice Boltzmann simulations, on a novel method to manipulate the...
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  32. 37. Large deviations and condensation
    Federico Corberi (SA)
    11/12/2015, 12:40
    Condensation is the phenomenon whereby a finite fraction of some quantity, e.g. a particle density, concentrates into a small region of phase-space, as in the paradigmatic example of a vapor transforming into a liquid when crossing a phase-transition. It is observed in a number of different models, related to magnetic properties, gravity, mass transport and other issues. A different...
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  33. 7. CONDENSATION OF FLUCTUATIONS
    Prof. Marco Zannetti (Università di Salerno)
    11/12/2015, 13:00
    Observing fluctuations of an extensive quantity is alike to put a constraint on the system. Though it may sound odd, the statement is of general validity, with far reaching consequences both in equilibrium and out of equilibrium. Its meaning becomes precise in the framework of large deviation theory. As an example of the connection, in the talk it will be shown that the so called...
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