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arXiv 1709.08013hep-ph
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Polyakov夸克介子耦合模型中的输运系数:弛豫时间近似

Transport coefficients in Polyakov quark meson coupling model: a relaxation time approximation

Aman Abhishek, Hiranmaya Mishra, Sabyasachi Ghosh

摘要:

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。在此模型中,利用介子-介子散射、夸克-介子散射和夸克-夸克散射估算了与能量有关的弛豫时间。在我们的计算中,剪切粘度熵比和热导率系数在临界温度处显示出最小值,而体粘度熵密度比在这个转变点处显示出一个峰值.通过Polyakov回路势建模的约束效应在估计这些耗散系数中起着重要的作用低于和高于临界温度.

英文摘要:

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 modelled through a Polyakov loop potential plays an important role in the estimation of these dissipative coefficients both below and above the critical temperature.

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