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arXiv 1610.07239nucl-th
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强子气体微观模拟中输运系数的确定

Determining Transport Coefficients for a Microscopic Simulation of a Hadron Gas

Scott Pratt, Alexander Baez, Jane Kim

摘要:

在相对论重离子碰撞中产生的夸克-胶子等离子体迅速膨胀和冷却,进入一个由多个相互作用的强子共振组成的阶段,刚好低于QCD解除禁闭温度$T\sim 155$ MeV。数值微观模拟已经成为模拟重离子碰撞强子阶段行为的主要方法,但是表征这些模拟的输运性质还没有得到很好的理解。这里提出的方法提取的剪切粘度,和两个运输参数出现在以色列-斯图尔特流体力学。该分析是基于研究应力-能量张量如何响应速度梯度。结果与基于久保关系的预期一致。

英文摘要:

Quark-Gluon plasmas produced in relativistic heavy-ion collisions quickly expand and cool, entering a phase consisting of multiple interacting hadronic resonances just below the QCD deconfinement temperature, $T\sim 155$ MeV. Numerical microscopic simulations have emerged as the principal method for modeling the behavior of the hadronic stage of heavy-ion collisions, but the transport properties that characterize these simulations are not well understood. Methods are presented here for extracting the shear viscosity, and two transport parameters that emerge in Israel-Stewart hydrodynamics. The analysis is based on studying how the stress-energy tensor responds to velocity gradients. Results agree with expectations based on Kubo relations.

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