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arXiv 0810.4851hep-thgr-qc
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强耦合重力场作用下钢管混凝土管的普遍流体力学

On the universal hydrodynamics of strongly coupled CFTs with gravity duals

Rajesh Kumar Gupta, Ayan Mukhopadhyay

摘要:

在四维共形规范理论的一个普适扇区中,具有$AdS_5$渐近性的纯经典五维引力解可以描述强耦合的大N动力学.我们表明,当边界度量是平坦的,我们可以唯一指定的解决方案的边界应力张量。我们还表明,在Festhiman-Graham坐标所有这些解决方案有一个整数泰勒级数展开的径向坐标(即没有$log$条款)。任意的应力张量会导致两种病态,它要么破坏渐近AdS边界条件,要么产生裸奇点。我们发现,当解决方案没有净角动量,所有的流体动力应力张量保持渐近AdS边界条件,虽然他们可能会产生裸奇点。我们构造的解决方案,对应于任意流体动力学应力张量在February man-Graham坐标使用的衍生物展开。与Eddington-Finkelstein坐标相比,这里的约束方程简化了,并且在每一阶上都是明显的洛伦兹协变。正则性分析变得更加复杂,但我们可以证明,存在唯一的流体动力应力张量,它给出了没有裸奇点的解。在这个过程中,我们写下来明确的一阶解在Fundaman-Graham和Eddington-Finkelstein坐标的流体动力应力张量与任意$η/s$。我们的解决方案可以描述任意(缓慢变化)的速度配置。我们指出我们的一般结果的一些场论的影响。

英文摘要:

It is known that the solutions of pure classical 5D gravity with $AdS_5$ asymptotics can describe strongly coupled large N dynamics in a universal sector of 4D conformal gauge theories. We show that when the boundary metric is flat we can uniquely specify the solution by the boundary stress tensor. We also show that in the Fefferman-Graham coordinates all these solutions have an integer Taylor series expansion in the radial coordinate (i.e. no $log$ terms). Specifying an arbitrary stress tensor can lead to two types of pathologies, it can either destroy the asymptotic AdS boundary condition or it can produce naked singularities. We show that when solutions have no net angular momentum, all hydrodynamic stress tensors preserve the asymptotic AdS boundary condition, though they may produce naked singularities. We construct solutions corresponding to arbitrary hydrodynamic stress tensors in Fefferman-Graham coordinates using a derivative expansion. In contrast to Eddington-Finkelstein coordinates here the constraint equations simplify and at each order it is manifestly Lorentz covariant. The regularity analysis, becomes more elaborate, but we can show that there is a unique hydrodynamic stress tensor which gives us solutions free of naked singularities. In the process we write down explicit first order solutions in both Fefferman-Graham and Eddington-Finkelstein coordinates for hydrodynamic stress tensors with arbitrary $η/s$. Our solutions can describe arbitrary (slowly varying) velocity configurations. We point out some field-theoretic implications of our general results.

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