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arXiv 1006.1902hep-thgr-qc
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流体/重力对偶的威尔逊方法

Wilsonian Approach to Fluid/Gravity Duality

Irene Bredberg, Cynthia Keeler, Vyacheslav Lysov, Andrew Strominger

摘要:

研究了一般黑洞几何中视界外半径为$r=r_c$的有限截断点内的引力涨落问题。一致的边界条件,在截止面和地平线上发现和由此产生的模式进行了分析。对于一般截止$r_c$,在长波长处的色散关系被证明是截止表面上线性化纳维尔-斯托克斯流体的色散关系。导出了扩散常数$D(r_c)$的截止依赖的线积分公式。对$r_c$的依赖性被解释为流体中的重整化群(RG)流动。在渐近AdS的情况下,取截止到无穷大,$D(\infty)$的公式再现作为一个特殊情况下,众所周知的结果,使用AdS/CFT。取视界截止,有效声速变为无穷大,流体变为不可压缩,Navier-Stokes色散关系变为精确的。由此产生的扩散常数$D(horizon)$的通用公式再现了来自膜范例的旧结果。因此,旧的膜范例结果和新的AdS/CFT结果与RG流相关。RG流不变性的粘度熵比$η/s$示出遵循热力学热力学第一定律与等熵的径向演化在经典重力。当量子引力修正被包括在内时,这个比率预计会运行。

英文摘要:

The problem of gravitational fluctuations confined inside a finite cutoff at radius $r=r_c$ outside the horizon in a general class of black hole geometries is considered. Consistent boundary conditions at both the cutoff surface and the horizon are found and the resulting modes analyzed. For general cutoff $r_c$ the dispersion relation is shown at long wavelengths to be that of a linearized Navier-Stokes fluid living on the cutoff surface. A cutoff-dependent line-integral formula for the diffusion constant $D(r_c)$ is derived. The dependence on $r_c$ is interpreted as renormalization group (RG) flow in the fluid. Taking the cutoff to infinity in an asymptotically AdS context, the formula for $D(\infty)$ reproduces as a special case well-known results derived using AdS/CFT. Taking the cutoff to the horizon, the effective speed of sound goes to infinity, the fluid becomes incompressible and the Navier-Stokes dispersion relation becomes exact. The resulting universal formula for the diffusion constant $D(horizon)$ reproduces old results from the membrane paradigm. Hence the old membrane paradigm results and new AdS/CFT results are related by RG flow. RG flow-invariance of the viscosity to entropy ratio $η/s$ is shown to follow from the first law of thermodynamics together with isentropy of radial evolution in classical gravity. The ratio is expected to run when quantum gravitational corrections are included.

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