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

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

2011-05-17

arxiv.org/abs/1105.3472v2

Physics

High Energy Physics

High Energy Physics - Theory

4 pages, 3 figures; v2: typos fixed, minor changes, version to appear in PRL

Scientific paper

10.1103/PhysRevLett.107.101601

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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