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arXiv 1004.0917gr-qchep-th
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具有非常曲率视界的Gauss-Bonnet黑洞

Gauss-Bonnet black holes with non-constant curvature horizons

Hideki Maeda

摘要:

本文研究了Einstein-Gauss-Bonnet引力场中的n(\ge 6)维黑洞的静态和动态性质,这些黑洞的视界具有n-2维Einstein空间的等距性,其Weyl张量的条件最初由Dotti和Gleiser给出.定义一个广义Misner-Sharp准局部质量,满足统一的第一定律,我们表明,大多数的准局部质量和捕获地平线的性质是共享的情况下,地平线的曲率不变。证明了当n-2维Einstein空间的翘曲因子为非常数时,Dotti-Gleiser解是唯一的真空解. Dotti-Gleiser黑洞的准定域质量变为常数,并满足黑洞热力学第一定律和Wald熵。在高斯-邦纳常数为正、宇宙学常数为零的非负曲率情况下,证明了Dotti-Gleiser黑洞是不稳定的.即使对于非零的宇宙学常数它变得局部稳定,对于正的宇宙学常数它也不能全局稳定。

英文摘要:

We investigate static and dynamical n(\ge 6)-dimensional black holes in Einstein-Gauss-Bonnet gravity of which horizons have the isometries of an (n-2)-dimensional Einstein space with a condition on its Weyl tensor originally given by Dotti and Gleiser. Defining a generalized Misner-Sharp quasi-local mass that satisfies the unified first law, we show that most of the properties of the quasi-local mass and the trapping horizon are shared with the case with horizons of constant curvature. It is shown that the Dotti-Gleiser solution is the unique vacuum solution if the warp factor on the (n-2)-dimensional Einstein space is non-constant. The quasi-local mass becomes constant for the Dotti-Gleiser black hole and satisfies the first law of the black-hole thermodynamics with its Wald entropy. In the non-negative curvature case with positive Gauss-Bonnet constant and zero cosmological constant, it is shown that the Dotti-Gleiser black hole is thermodynamically unstable. Even if it becomes locally stable for the non-zero cosmological constant, it cannot be globally stable for the positive cosmological constant.

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