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arXiv 0809.3808hep-thgr-qc
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AdS/CFT和膜范例中流体动力学极限的普适性

Universality of the hydrodynamic limit in AdS/CFT and the membrane paradigm

Nabil Iqbal, Hong Liu

摘要:

我们表明,在线性响应水平上,有限温度下强耦合场论的低频极限由其引力对偶的视界几何决定,即由经典黑洞力学的“膜范式”流体决定.因此,一般边界理论输运系数可以表示为在地平线上计算的几何量。当应用于应力张量时,这给出了一个简单的、普遍的证明,证明了剪切粘性在引力耦合普遍性方面的普遍性,当应用于守恒电流时,它给出了一个新的电导率的一般公式。远离低频极限的边界理论流体的行为不再完全捕获的地平线流体,即使在衍生的扩展,相反,我们发现一个非平凡的演变从地平线的边界。我们推导出控制这种演变的流动方程,并将其应用到电荷和动量扩散的简单例子。

英文摘要:

We show that at the level of linear response the low frequency limit of a strongly coupled field theory at finite temperature is determined by the horizon geometry of its gravity dual, i.e. by the "membrane paradigm" fluid of classical black hole mechanics. Thus generic boundary theory transport coefficients can be expressed in terms of geometric quantities evaluated at the horizon. When applied to the stress tensor this gives a simple, general proof of the universality of the shear viscosity in terms of the universality of gravitational couplings, and when applied to a conserved current it gives a new general formula for the conductivity. Away from the low frequency limit the behavior of the boundary theory fluid is no longer fully captured by the horizon fluid even within the derivative expansion; instead we find a nontrivial evolution from the horizon to the boundary. We derive flow equations governing this evolution and apply them to the simple examples of charge and momentum diffusion.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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