Effects of Bulk Viscosity at Freezeout
Effects of Bulk Viscosity at Freezeout
复制标题
DOI：
10.1103/physrevc.80.054906
复制
发表时间：
2009-03
影响因子：
3.1
通讯作者：
A. Monnai;Tetsufumi Hirano
中科院分区：
文献类型：
--
作者：
A. Monnai;Tetsufumi Hirano
我们研究了相对论重离子碰撞中的粒子谱和椭圆流系数，并考虑了冻结时体粘滞对相空间分布的畸变。我们首先用格拉德的14阶矩法计算了多组分体系相空间分布的畸变。我们发现一些微妙的问题时，宏观变量与微观动量分布相匹配的多组分系统，我们开发了一个一致的程序，唯一确定的修正相空间分布。接下来，我们通过使用Cooper-Frye公式来计算粒子谱，以了解体粘度的影响。尽管体积粘度相对较小，我们发现，它可能有一个可见的颗粒光谱和椭圆流系数的影响。这表明考虑体积粘度和剪切粘度的重要性，以约束传输系数与实验数据相比，具有更好的精度。
We investigate particle spectra and elliptic flow coefficients in relativistic heavy-ion collisions by taking into account the distortion of phase space distributions by bulk viscosity at freezeout. We first calculate the distortion of phase space distributions in a multicomponent system with Grad's 14-moment method. We find some subtle issues when macroscopic variables are matched with microscopic momentum distributions in a multicomponent system, and we develop a consistent procedure to uniquely determine the corrections to the phase space distributions. Next, we calculate particle spectra by using the Cooper-Frye formula to see the effect of the bulk viscosity. Despite the relative smallness of the bulk viscosity, we find that it is likely to have a visible effect on particle spectra and elliptic flow coefficients. This indicates the importance of taking into account bulk viscosity together with shear viscosity to constrain the transport coefficients with better accuracy from comparison with experimental data.