### Description

Wine and cheese tasting

Vasily Sazonov
(LPT Orsay, Université Paris-Sud)

26/06/2017, 17:20

poster

Motivated by the recent discovery of the $SU(2N_F)$ symmetric degeneracy in the spectrum of QCD with truncated low modes of the Dirac operator, we derive Ward identities associated to $SU(2N_F)$-transformations in the limit of vanishing quark masses. Low temperature QCD is not invariant under the $SU(2N_F)$-transformations due to the non-invariance of the classical action and the path integral...

Takahiro Doi
(Quantum Hadron Physics Laboratory Theoretical Research Division, Nishina Center, RIKEN)

26/06/2017, 17:20

poster

The numerical simulation for the lattice QCD at finite density is difficult to perform due to the sign problem. The Lefschetz thimble method is expected to give us a possible solution of the sign problem. However, this method has the global sign problem, which is cancellation between thimbles, and this problem has not been solved yet. We develop a new method to avoid the global sign problem by...

Jarno Rantaharju
(Duke University)

26/06/2017, 17:20

poster

We present a study of the finite density lattice Thirring model in 2 dimensions using the world-line/fermion-bag algorithm. The model has features similar to QCD and provides a test case to explore the accuracy of various methods to solve sign problems. In the massless limit and with open boundary conditions we show that the sign problem is an artifact of the auxiliary field approach and is...

Benjamin Jaeger
(ETH Zurich)

26/06/2017, 17:20

poster

Several important observables, like the quark condensate and the Taylor coefficients of the QCD pressure with respect to the chemical potential, are based on the trace of the inverse Dirac operator or its powers. Such traces are traditionally estimated with "noise vectors". We explore alternative approaches based on polynomial approximations of the inverse Dirac operator.

Asobu Suzuki
(University of Tsukuba)

26/06/2017, 17:20

poster

$B_{K}$ is a parameter which is related with the Kaon mixing and is one of the targets of Lattice QCD.
Naive calculation of $B_{K}$ with the Wilson fermion is difficult because the chiral symmetry is explicitly broken.
In this study we shall present on our calculation of $B_{K}$ with the Wilson fermion by applying the gradient flow method both to the gauge and quark fields.
Our study is...

Tamaz Khunjua
(Moscow State University M.V. Lomonosov)

26/06/2017, 17:20

poster

We investigate the phase structure of a (1+1)-dimensional schematic quark model with four-quark interaction and in the presence of baryon (μB), isospin (μI) and chiral isospin (μI5) chemical potentials. It is established that in the large-Nc limit (Nc is the number of colored quarks) there exists a duality correspondence between the chiral symmetry breaking phase and the charged pion...

Andrea Rucci
(PI)

26/06/2017, 17:20

poster

I will present recent results obtained in the study of the color
magnetic and electric screening masses in the QCD plasma.
I will focus on how the masses get modified by strong
magnetic background fields which are expected to be created
in particular physical contexts such as heavy-ion collisions.

Savvas Zafeiropoulos
(College of William & Mary and Jefferson Lab)

26/06/2017, 17:20

poster

We study an RMT model for QCD at finite density using the Complex Langevin algorithm. Naive implementation of the algorithm shows convergence towards the phase quenched or quenched theory. A detailed analysis of this issue and a potential resolution of the failure of this algorithm are discussed. Among others we study the behavior of the real and imaginary parts of the action under Langevin...

Masakiyo Kitazawa
(Osaka University)

26/06/2017, 17:20

poster

We study the temporal correlators of energy-momentum tensor in various channels in SU(3) gauge theory for two values of temperature T = 1.68T c and 2.24T c on the lattice. The correlators are measured using energy-momentum tensor operators constructed with the gradient flow, which is found to be quite effective to reduce the statistical error. We numerically confirm that temporal correlators...

Francesco Sanfilippo
(INFN - Sezione Roma III)

26/06/2017, 17:20

poster

I present a determination of the cumulants of the quark number fluctuations, obtained via analytic continuation of Nf=2+1 physical quark mass lattice QCD simulations at imaginary chemical potentials. We employ stout improved staggered fermions and tree level Symanzik gauge action, exploring temperatures ranging from 135 up to 350 MeV, adopting mostly lattices with Nt=8 sites in the temporal...

Kevin Zambello
(P)

26/06/2017, 17:20

poster

We study the curvature of the pseudo-critical line in N_f=2+1 QCD through numerical simulations performed using the tree-level Symanzik gauge action and the stout-smeared staggered action. The location of the phase transition is determined from the inflection point of the renormalized chiral condensate and the curvature coefficient is calculated using the Taylor expansion adopting various...

Souvik Priyam Adhya
(Post doctoral fellow)

26/06/2017, 17:20

poster

In this work, the self energies of $\pi_0$ and $\pi_{\pm}$ up to one loop order have been calculated in the limit of weak
external magnetic field . The effective
masses get an explicit magnetic field dependence which are modified significantly for the pseudo-scalar coupling due to weak field approximation of the external field. However, for the pseudo-vector coupling, only a modest...

Davide De Boni
(Swansea University)

26/06/2017, 17:20

poster

What is the dynamics of heavy quarks and antiquarks in a quark gluon plasma? Can heavy-quark bound states (quarkonia) dissociate? Can they (re)combine?
These are the questions that this paper aims to address by investigating a Lindblad equation that describes the quantum dynamics of the heavy particles in the medium.
The Lindblad equations for a heavy quark and a heavy quark-antiquark pair...

Francesco Negro
(PI)

26/06/2017, 17:20

poster

We study the confining flux tube between two static color sources and its scaling towards the continuum limit in Nf=2+1 QCD at the physical point.
To this aim, we discretize the theory with the tree level Symanzik gauge action and stout-smearing improved staggered quarks. We discuss the effect of a uniform external magnetic field on the flux tube and we show, in particular, that it displays...

Dr
Francesca Cuteri
(Goethe Universität - Frankfurt am Main)

26/06/2017, 17:20

poster

Flux Tubes in QCD across deconfinementFlux Tubes in QCD across deconfinementFlux Tubes in QCD across deconfinementFlux Tubes in QCD across deconfinementFlux Tubes in QCD across deconfinementFlux Tubes in QCD across deconfinementFlux Tubes in QCD across deconfinementFlux Tubes in QCD across deconfinement

Matteo Buzzegoli
(FI)

26/06/2017, 17:20

poster

The quark-gluon plasma created in heavy ion collisions can be described as a
relativistic fluid with high values of acceleration and vorticity and, in such
extreme local equilibrium conditions, the standard hydrodynamic equations are
expected to receive corrections from the non-ideal non-dissipative terms of the
stress-energy tensor.
We show how these corrections can be obtained in a...

Ouraman Hajizadeh
(University of Graz)

26/06/2017, 17:20

poster

SU(2) is the simplest non-abelian gauge theory with fermions without sign problem. Therefore its study on the lattice is a benchmark for other non-perturbative approaches at finite density.
We study the Landau-gauge 2-point and 3-point correlation functions of the gauge sector and the running gauge coupling at finite density, and compare them to the vacuum case.
We observed no...

Yoshifumi Nakamura
(RIKEN)

26/06/2017, 17:20

poster

We investigate the critical endpoints of the finite temperature
phase transition of QCD at zero chemical potential.
We employ the renormalization-group improved Iwasaki gauge action and
non-perturbatively $O(a)$-improved Wilson-clover fermion action.
The critical endpoints are determined by using the intersection point of kurtosis,
employing the multi-parameter, multi-ensemble...

Semen Valgushev
(Regensburg University)

26/06/2017, 17:20

poster

We present first-principle lattice study of continuity conjecture in $2d$ $SU(N) \times SU(N)$ Principal Chiral Model (PCM) on $\mathbb{R} \times S^1$ with respect to circumference $L$ of $S^1$ in the presence of $Z(N)$-preserving twist. The twist can be considered as analogous to Twisted Eguchi-Kawai reduction in lattice gauge theory. We study static correlation length and find that it...

Hirotsugu Fujii
(U Tokyo)

26/06/2017, 17:20

poster

We apply complex Langevin equation (CLE) to simulate the 0+1 dimensional Thirring model at finite density. In the crossover region the simulation fails because of the zero of the fermion determinant. To simulate the crossover retion, we then apply the reweighting method with the ensembles generated with CLE at high enough chemical potential. We study the effectiveness of the reweighting...

Caroline Felix
(KU Leuven)

26/06/2017, 17:20

poster

The topological susceptibility, $\chi^4$, plays an important role in explaining the $\eta^{\prime}$ mass, the so-called $U(1)_{A}$ problem. For $\chi^4 \neq 0$, we must have the Veneziano ghost, an unphysical massless pole in the correlation function of the topological current $K_{\mu}$ correlator. There was a recent attempt in http://inspirehep.net/record/1340323?ln=
en to connect the...

Aleksandr Nikolaev
(ITEP & FEFU)

26/06/2017, 17:20

poster

In this report we study the properties of the dense SU(2) QCD. The
lattice simulations are carried out with improved gauge action and
smaller lattice spacing as compared to our previous work. This allowed us to approach closer to the continuum limit and reach larger densities without lattice artifacts. We measured string tension and Polyakov loop as functions of chemical potential and...