Temperature dependence of bulk viscosity of SU(3)– gluodynamics within lattice simulation
Institute for Theoretical and Experimental Physics, Moscow, 117218 Russia
2 Moscow Institute of Physics and Technology, Dolgoprudny, 141700 Russia
3 Far Eastern Federal University, School of Biomedicine, Vladivostok, 690950 Russia
4 Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, Dubna, 141980 Russia
Published online: 3 August 2018
In this paper we present the results of the measurements of bulk viscosity temperature dependence in SU(3)-gluodynamics by means of lattice simulations. Our approach is based on the Kubo formula, which relates bulk viscosity and the correlator of the energy-momentum trace anomaly. We measured the correlation functions of the energy-momentum trace anomaly in the range of temperatures T/Tc ϵ [0.9, 1.5] and extracted the value of bulk viscosity using two methods. The first one was to apply the middle-point estimation. The second method is based on the Backus-Gilbert method allowing to extract the bulk viscosity from the lattice data nonparametrically. The results obtained within both methods are in agreement. Based on our results we conclude that the Gluon Plasma under study reveals the properties of a strongly interacting system, which cannot be described perturbatively.
© The Authors, published by EDP Sciences 2018
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.