Transport Coefficients of Hot and Dense Matter

Transport Coefficients of Hot and Dense Matter
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热稠物质的输运系数

DOI：
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发表时间：
2019
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通讯作者：
E. Bratkovskaya
E. Bratkovskaya
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文献类型：
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作者：
O. Soloveva;P. Moreau;L. Oliva;T. Song;W. Cassing;E. Bratkovskaya

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我们使用动态准粒子模型 (DQPM) 中的分子散射截面作为温度 $T$ 和重子化学势 $\mu_B$ 的函数来计算热稠密夸克-胶子等离子体 (QGP) 的剪切粘度，该模型被匹配以从晶格 QCD 再现高于解约束温度 $T_c$ 的分子系统的状态方程。为此，我们计算类时扇区中有限 $T$ 和 $\mu_B$ 处的部分自由度的碰撞宽度，并得出结论，准粒子极限足够好。此外，使用这些碰撞宽度评估剪切粘度 $\eta$ 与熵密度 $s$ 的比率，即 $\eta/s$，并与 $\mu_B$ = 0 时的 lQCD 计算进行比较。我们发现比率 $\eta/s$ 与基于 Kubo 形式主义的原始 DQPM 中的计算结果一致。此外，重子化学物质 $\mu_B$ 作为缩放温度 $T/T_c(\mu_B)$ 的函数，$\eta/s$ 仅发生非常适度的变化。
We present calculations for the shear viscosity of the hot and dense quark-gluon plasma (QGP) using the partonic scattering cross sections as a function of temperature $T$ and baryon chemical potential $\mu_B$ from the dynamical quasiparticle model (DQPM) that is matched to reproduce the equation of state of the partonic system above the deconfinement temperature $T_c$ from lattice QCD. To this aim we calculate the collisional widths for the partonic degrees of freedom at finite $T$ and $\mu_B$ in the time-like sector and conclude that the quasiparticle limit holds sufficiently well. Furthermore, the ratio of shear viscosity $\eta$ over entropy density $s$, i.e. $\eta/s$, is evaluated using these collisional widths and are compared to lQCD calculations for $\mu_B$ = 0 as well. We find that the ratio $\eta/s$ is in agreement with the results of calculations within the original DQPM on the basis of the Kubo formalism. Furthermore, there is only a very modest change of $\eta/s$ with the baryon chemical $\mu_B$ as a function of the scaled temperature $T/T_c(\mu_B)$.