Transport coefficients in the Polyakov quark meson coupling model: A relaxation time approximation
Transport coefficients in the Polyakov quark meson coupling model: A relaxation time approximation
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DOI：
10.1103/physrevd.97.014005
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发表时间：
2017-09
影响因子：
5
通讯作者：
Aman Abhishek;H. Mishra;Sabyasachi Ghosh
中科院分区：
文献类型：
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作者：
Aman Abhishek;H. Mishra;Sabyasachi Ghosh
我们计算的传输系数，即剪切和体积粘度的系数，以及热的和致密的物质的热导率。计算是在Polyakov夸克介子模型中进行的。输运系数的估计是使用玻尔兹曼动力学方程内的弛豫时间近似。能量依赖的弛豫时间是由模型中的介子-介子散射、夸克-介子散射和夸克-夸克散射估计的。在我们的计算中，剪切粘度熵比和导热系数在临界温度处显示出最小值，而体粘度熵密度比在该转变点处显示出峰值。通过Polyakov回路势建模的约束效应在临界温度以下和以上都起着重要的作用。
We compute the transport coefficients, namely, the coefficients of shear and bulk viscosities, as well as thermal conductivity for hot and dense matter. The calculations are performed within the Polyakov quark meson model. The estimation of the transport coefficients is made using the Boltzmann kinetic equation within the relaxation time approximation. The energy-dependent relaxation time is estimated from meson-meson scattering, quark-meson scattering, and quark-quark scattering within the model. In our calculations, the shear viscosity to entropy ratio and the coefficient of thermal conductivity show a minimum at the critical temperature, while the ratio of bulk viscosity to entropy density exhibits a peak at this transition point. The effect of confinement modeled through a Polyakov loop potential plays an important role both below and above the critical temperature.