标题： 强子共振气体和热质量准粒子模型的瞬态流体力学输运系数 显示英文标题

标题： Transport coefficients of transient hydrodynamics for the hadron-resonance gas and thermal-mass quasiparticle models

摘要： 我们计算了两种有效动理学理论模型中的二阶瞬态流体力学的所有输运系数：强子共振气体模型和经过热质量调节以重现QCD热力学的准粒子模型。 我们将相应的结果与广泛用于重离子碰撞流体力学模拟的超相对论单组分气体的计算结果进行了比较。 我们发现，与单组分气体的计算相比，这两种有效模型的归一化体积粘度表现出定性上的不同。 实际上， 强子共振气体模型的$\zeta/[\tau_{\Pi}(\varepsilon_{0} + P_{0})] \simeq 16.91(1/3-c_{s}^{2})^{2}$和准粒子模型的$\zeta/[\tau_{\Pi}(\varepsilon_{0} + P_{0})] \simeq 5 (1/3-c_{s}^{2})$。 许多二阶输运系数也观察到了差异，尤其是那些与体积粘性压力相关的系数。 得出的输运系数被证明符合基本的线性稳定性与因果性条件。 显示英文摘要

摘要： We calculate all transport coefficients of second order transient hydrodynamics in two effective kinetic theory models: a hadron-resonance gas and a quasiparticle model with thermal masses tuned to reproduce QCD thermodynamics. We compare the corresponding results with calculations for an ultrarelativistic single-component gas, that are widely employed in hydrodynamic simulations of heavy ion collisions. We find that both of these effective models display a qualitatively different normalized bulk viscosity, when compared to the calculation for the single-component gas. Indeed, $\zeta/[\tau_{\Pi}(\varepsilon_{0} + P_{0})] \simeq 16.91(1/3-c_{s}^{2})^{2}$, for the hadron-resonance gas model, and $\zeta/[\tau_{\Pi}(\varepsilon_{0} + P_{0})] \simeq 5 (1/3-c_{s}^{2})$ for the quasiparticle model. Differences are also observed for many second-order transport coefficients, specially those related to the bulk viscous pressure. The transport coefficients derived are shown to be consistent with fundamental linear stability and causality conditions.