将远离平衡的流体动力学与图解的输运系数和吸引子联系起来
Connecting far-from-equilibrium hydrodynamics to resummed transport coefficients and attractors
摘要：
我们研究了在重离子碰撞中形成的夸克-胶子等离子体的模拟中是否存在流体动力学吸引子。我们认为，拉格朗日格式求解相对论粘性流体方程可以特别有用的重离子碰撞中的吸引子的性质的特征。初步结果显示在以色列-斯图尔特理论支持这样的说法。我们还讨论了如何执行缓慢的滚动扩展在以色列斯图尔特理论经历一个一般的流动，这自然会导致一个图解剪切粘度系数的定义，取决于梯度的流体动力场。
英文摘要：
We investigate whether hydrodynamic attractors are present in simulations of the quark-gluon plasma formed in heavy-ion collisions. We argue that Lagrangian schemes to solve the relativistic viscous fluid equations can be particularly useful to characterize the properties of attractors in heavy ion collisions. Preliminary results are shown in Israel-Stewart theory to support such a claim. We also discuss how to perform the slow-roll expansion in Israel-Stewart theory undergoing a general flow, which naturally leads to the definition of a resummed shear viscosity coefficient that depends on the gradients of the hydrodynamic fields.
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