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arXiv 1105.4645hep-thhep-phnucl-th
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基于AdS/CFT的三点应力张量关联函数二阶流体动力学系数

Second order hydrodynamic coefficients from 3-point stress tensor correlators via AdS/CFT

Peter Arnold, Diana Vaman, Chaolun Wu, Wei Xiao

摘要:

本文在四维共形场论中研究二阶相对论粘性流体力学。本文导出了用三点应力张量延迟关联函数表示的二阶水动力系数的Kubo型关系式。对于N=4的强耦合和有限温度下的超级杨-米尔斯理论,我们计算这些应力张量3点关联函数,使用AdS/CFT,通过评估实时立方Witten图在AdS-Schwarzschild背景。三点关联函数在一阶和二阶水动力系数方面的小动量展开与AdS结果相匹配。我们得到了与Bhattacharyya、Hubeny、Minwalla和Rangamani \cite{Bhattacharyya:2008jc}相同的流体动力系数表达式,该表达式乘以应力张量的流体动力展开中的剪切张量和涡量张量的二次项。我们的方法扩展了Baier等人的\cite{Baier:2007ix}的结果,并允许一个统一的处理的流体动力学系数,这是从2-,现在,3点延迟应力张量关联函数在AdS-Schwarzschild背景中提取。

英文摘要:

We study second order relativistic viscous hydrodynamics in 4-dimensional conformal field theories. We derive Kubo-type relations for second order hydrodynamic coefficients in terms of 3-point stress tensor retarded correlators. For N=4 super Yang-Mills theory at strong coupling and at finite temperature we compute these stress tensor 3-point correlators, using AdS/CFT, by evaluating real-time cubic Witten diagrams in the AdS-Schwarzschild background. The small momentum expansion of the 3-point correlators in terms of first and second order hydrodynamic coefficients is matched with the AdS result. We arrive at the same expressions for the hydrodynamic coefficients which multiply terms quadratic in the shear and vorticity tensors in the hydrodynamic expansion of the stress tensor as did Bhattacharyya, Hubeny, Minwalla and Rangamani \cite{Bhattacharyya:2008jc}. Our method extends the results of Baier et al \cite{Baier:2007ix}, and allows for a unified treatment of hydrodynamic coefficients, which are extracted from 2-, and now, 3-point retarded stress tensor correlators in the AdS-Schwarzschild background.

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