Temperature dependence of shear viscosity of

This report is devoted to the study of temperature dependence of shear viscosity in SU(3)-gluodynamics. To calculate shear viscosity we measured the correlation function of the energy-momentum tensor T12T12 for a set of temperatures in the region T/Tc ϵ (0.9, 1.5). The measurements were carried out using multilevel algorithm which considerably improves the accuracy of the data. For determination of the shear viscosity two methods were used: physically motivated ansatz and non-parametrical Backus-Gilbert method. Both methods give consistent results. The calculation allows to determine temperature dependence of the ratio of shear viscosity to the entropy density η/s

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

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