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arXiv 0712.4155hep-th
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强耦合下的Hedgehog黑洞和Polyakov环

Hedgehog black holes and the Polyakov loop at strong coupling

Matthew Headrick

摘要:

在N=4的超杨-米尔斯理论中,在大N,大λ和有限温度下,包裹欧几里得时间圆的威尔逊-马尔达塞纳环(Polyakov-Maldacena loop,或PML)的值是由对偶超引力背景中某个极小曲面的面积计算的。通过在体作用量中引入一个固定适当最小表面的(平均)面积的拉格朗日乘子项,该处方可用于计算作为PML(在空间坐标上平均)函数的自由能。这一项也可以被看作是PML的化学势,它对体应力张量的贡献就像一根从视界延伸到边界的弦(在角方向上模糊)。我们在一个SO(6)-保持的近似下用数值方法找到了相应的“刺猬”黑洞解,并导出了PML的部分自由能图.作为一个热身问题,我们还找到了刺猬黑洞在纯引力下的精确解,并导出了该系统的自由能和相图。

英文摘要:

In N=4 super-Yang-Mills theory at large N, large λ, and finite temperature, the value of the Wilson-Maldacena loop wrapping the Euclidean time circle (the Polyakov-Maldacena loop, or PML) is computed by the area of a certain minimal surface in the dual supergravity background. This prescription can be used to calculate the free energy as a function of the PML (averaged over the spatial coordinates), by introducing into the bulk action a Lagrange multiplier term that fixes the (average) area of the appropriate minimal surface. This term, which can also be viewed as a chemical potential for the PML, contributes to the bulk stress tensor like a string stretching from the horizon to the boundary (smeared over the angular directions). We find the corresponding "hedgehog" black hole solutions numerically, within an SO(6)-preserving ansatz, and derive part of the free energy diagram for the PML. As a warm-up problem, we also find exact solutions for hedgehog black holes in pure gravity, and derive the free energy and phase diagrams for that system.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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