Temperature dependence of the bulk viscosity within lattice simulation of SU(3) gluodynamics
Temperature dependence of the bulk viscosity within lattice simulation of
SU(3)
gluodynamics
复制标题
SU(3) 胶动力学晶格模拟中体积粘度的温度依赖性
作者：
N. Astrakhantsev;V. Braguta;A. Kotov
本文用格点模拟方法研究了SU（3）-胶子动力学体粘滞系数的温度依赖性。为了进行这项研究，我们测量的能量动量张量的轨迹的相关函数为一组温度范围内的T/T_c \in（0.9，1.5）$。为了从相关函数中提取体积粘度，我们应用Backus-Gilbert方法和Tikhonov正则化方法。我们发现，$\zeta/s$是小的区域$T/T_c \geqslant 1.1-1.2$和在附近的过渡$T/T_c \leqslant 1.1-1.2$它迅速上升。我们的结果与以前的晶格研究，并在一个合理的协议与其他唯象方法。所得到的体粘滞系数值明显大于微扰结果，证实了QGP是一个强关联系统。
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 $T/T_c \in (0.9, 1.5)$. 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 $\zeta/s$ 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.
影响因子：
5
作者：
B. Brandt;A. Francis;H. Meyer;Daniel Robaina
通讯作者：
B. Brandt;A. Francis;H. Meyer;Daniel Robaina