Description
Wine and cheese tasting
-
Vasily Sazonov (LPT Orsay, Université Paris-Sud)26/06/2017, 17:20posterMotivated 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...Go to contribution page
-
Takahiro Doi (Quantum Hadron Physics Laboratory Theoretical Research Division, Nishina Center, RIKEN)26/06/2017, 17:20posterThe 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...Go to contribution page
-
Jarno Rantaharju (Duke University)26/06/2017, 17:20posterWe 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...Go to contribution page
-
Benjamin Jaeger (ETH Zurich)26/06/2017, 17:20posterSeveral 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.Go to contribution page
-
Asobu Suzuki (University of Tsukuba)26/06/2017, 17:20poster$B_{K}$ 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...Go to contribution page
-
Tamaz Khunjua (Moscow State University M.V. Lomonosov)26/06/2017, 17:20posterWe 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...Go to contribution page
-
Andrea Rucci (PI)26/06/2017, 17:20posterI 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.Go to contribution page
-
Mohamed Anber (Lewis & Clark College)26/06/2017, 17:20poster
-
Savvas Zafeiropoulos (College of William & Mary and Jefferson Lab)26/06/2017, 17:20posterWe 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...Go to contribution page
-
Masakiyo Kitazawa (Osaka University)26/06/2017, 17:20posterWe 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...Go to contribution page
-
Francesco Sanfilippo (INFN - Sezione Roma III)26/06/2017, 17:20posterI 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...Go to contribution page
-
Kevin Zambello (P)26/06/2017, 17:20posterWe 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...Go to contribution page
-
Souvik Priyam Adhya (Post doctoral fellow)26/06/2017, 17:20posterIn 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...Go to contribution page
-
Davide De Boni (Swansea University)26/06/2017, 17:20posterWhat 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...Go to contribution page
-
Francesco Negro (PI)26/06/2017, 17:20posterWe 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...Go to contribution page
-
Dr Francesca Cuteri (Goethe Universität - Frankfurt am Main)26/06/2017, 17:20posterFlux 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 deconfinementGo to contribution page
-
Matteo Buzzegoli (FI)26/06/2017, 17:20posterThe 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...Go to contribution page
-
Ouraman Hajizadeh (University of Graz)26/06/2017, 17:20posterSU(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...Go to contribution page
-
Yoshifumi Nakamura (RIKEN)26/06/2017, 17:20posterWe 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...Go to contribution page
-
Semen Valgushev (Regensburg University)26/06/2017, 17:20posterWe 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...Go to contribution page
-
Hirotsugu Fujii (U Tokyo)26/06/2017, 17:20posterWe 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...Go to contribution page
-
Caroline Felix (KU Leuven)26/06/2017, 17:20posterThe 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...Go to contribution page
-
Aleksandr Nikolaev (ITEP & FEFU)26/06/2017, 17:20posterIn 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...Go to contribution page