Temperature dependence of bulk viscosity within lattice simulation of SU(3)--gluodynamics

2018/04/09 by N. Yu. Astrakhantsev, V. V. Braguta, A. Yu. Kotov · 1 citation
Physics and Astronomy · #hep-lat #hep-ph #hep-th

paper · pdf · doi:10.1103/physrevd.98.054515

published as Phys. Rev. D 98, 054515 (2018)

arxiv created 2018/04/09 · arxiv updated 2018/10/03

Abstract

In this paper the temperature dependence of the SU(3)--gluodynamics bulk viscosity is studied within lattice simulations. To carry out this study we measure the correlation function of the trace of the energy-momentum tensor for a set of temperatures within the range T/T_c ∈ (0.9, 1.5). To extract the bulk viscosity from the correlation function we apply the Backus-Gilbert method and the Tikhonov regularization method. We show that the ratio ζ/s is small in the region T/T_c \geqslant 1.1-1.2 and in the vicinity of the transition T/T_c \leqslant 1.1-1.2 it quickly rises. Our results are in agreement with previous lattice studies and in a reasonable agreement with other phenomenological approaches. Obtained values of the bulk viscosity are significantly larger than perturbative results, what confirms that QGP is a strongly correlated system.

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