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arXiv 1105.3472hep-thhep-ph
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各向异性N=4超Yang-Mills等离子体及其不稳定性

The anisotropic N=4 super Yang-Mills plasma and its instabilities

David Mateos, Diego Trancanelli

摘要:

我们提出了一个IIB超重力解对偶空间各向异性有限温度N=4超级杨米尔斯等离子体。该解是静态的,具有各向异性的视界,并且是完全正则的。完整的几何可以看作是一个重整化群流,从紫外线的AdS几何到红外线的类Lifshitz几何。各向异性可以等价地理解为由位置依赖的θ项或溶解的D 7-膜的非零数密度产生。全息应力张量是守恒的和各向异性的。共形反常的存在在系统的热力学中起着重要的作用。我们构建的相图,其中表现出均匀和非均匀(即混合)的阶段,并评论在有限重子密度与QCD的相似性。在低密度的均匀相显示几个不稳定性,让人想起弱耦合等离子体的不稳定性。

英文摘要:

We present a IIB supergravity solution dual to a spatially anisotropic finite-temperature N=4 super Yang-Mills plasma. The solution is static, possesses an anisotropic horizon, and is completely regular. The full geometry can be viewed as a renormalization group flow from an AdS geometry in the ultraviolet to a Lifshitz-like geometry in the infrared. The anisotropy can be equivalently understood as resulting from a position-dependent theta-term or from a non-zero number density of dissolved D7-branes. The holographic stress tensor is conserved and anisotropic. The presence of a conformal anomaly plays an important role in the thermodynamics of the system. We construct the phase diagram, which exhibits homogeneous and inhomogeneous (i.e. mixed) phases, and comment on similarities with QCD at finite baryon density. At low densities the homogeneous phase displays several instabilities reminiscent of instabilities of weakly coupled plasmas.

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