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arXiv 0806.0006hep-thgr-qcphysics.flu-dyn
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由重力引起的受迫流体动力学

Forced Fluid Dynamics from Gravity

Sayantani Bhattacharyya, R. Loganayagam, Shiraz Minwalla, Suresh Nampuri, Sandip P. Trivedi, Spenta R. Wadia

摘要:

我们推广arXiv:0712.2456的计算,以产生具有缓变边界介子场和弱弯曲边界度规的Einstein-Einstein介子系统的长波长、渐近局部AdS_5解。在要求的规律性,我们的解决方案是双重的,根据AdS/CFT对应,任意流体流动的边界理论制定的弱弯曲的流形与规定的缓慢变化的耦合常数。这些解决方案原来是参数化的四个速度和温度场的约束,以服从边界协变纳维-斯托克斯方程与依赖于强迫项。我们明确评估的应力张量和拉格朗日作为速度,温度,耦合常数和曲率场的函数,二阶导数展开,并证明这些表达式的Weyl协方差。我们还构造了二阶导数展开对偶解的事件视界,并利用这个事件视界上的面积形式构造了对偶流体的熵流。作为对我们构造的检验,我们将已知的全局AdS_5中旋转黑洞的精确解用边界导数展开式展开,并找到了与我们的结果完全一致的二阶解.我们还发现其他简单的解决方案的强制流体力学方程,并讨论其散装解释。我们的研究结果可能有助于确定一个散装双强制流动表现出稳态湍流。

英文摘要:

We generalise the computations of arXiv:0712.2456 to generate long wavelength, asymptotically locally AdS_5 solutions to the Einstein-dilaton system with a slowly varying boundary dilaton field and a weakly curved boundary metric. Upon demanding regularity, our solutions are dual, under the AdS/CFT correspondence, to arbitrary fluid flows in the boundary theory formulated on a weakly curved manifold with a prescribed slowly varying coupling constant. These solutions turn out to be parametrised by four-velocity and temperature fields that are constrained to obey the boundary covariant Navier Stokes equations with a dilaton dependent forcing term. We explicitly evaluate the stress tensor and Lagrangian as a function of the velocity, temperature, coupling constant and curvature fields, to second order in the derivative expansion and demonstrate the Weyl covariance of these expressions. We also construct the event horizon of the dual solutions to second order in the derivative expansion, and use the area form on this event horizon to construct an entropy current for the dual fluid. As a check of our constructions we expand the exactly known solutions for rotating black holes in global AdS_5 in a boundary derivative expansion and find perfect agreement with all our results upto second order. We also find other simple solutions of the forced fluid mechanics equations and discuss their bulk interpretation. Our results may aid in determining a bulk dual to forced flows exhibiting steady state turbulence.

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