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arXiv 0904.1741gr-qcastro-ph.COhep-th
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准黑洞的熵

Entropy of quasiblack holes

José P. S. Lemos, Oleg B. Zaslavskii

摘要:

我们追踪了用准黑洞代替黑洞的黑洞熵S的起源。让一个静止物体的边界接近它自己的引力半径,以这种方式形成一个准视界。我们证明,如果物体是热的,温度在准视界极限取霍金值,则在非极值情况下,由热力学热力学第一定律得出熵接近贝肯斯坦-霍金值S=A/4。在这个设置中,起关键作用的是准视界上的表面应力,人们发现熵来自准视界表面。表面内物质的任何分布都会导致准视界极限中熵的相同普适值。这对理解黑洞熵有一定的帮助。黑洞和准黑洞之间的其他相似之处,比如两个物体的质量公式,以前已经被发现。我们还讨论了极端准黑洞的熵,一个更微妙的问题。

英文摘要:

We trace the origin of the black hole entropy S replacing a black hole by a quasiblack hole. Let the boundary of a static body approach its own gravitational radius, in such a way that a quasihorizon forms. We show that if the body is thermal with the temperature taking the Hawking value at the quasihorizon limit, it follows, in the nonextremal case, from the first law of thermodynamics that the entropy approaches the Bekenstein-Hawking value S=A/4. In this setup, the key role is played by the surface stresses on the quasihorizon and one finds that the entropy comes from the quasihorizon surface. Any distribution of matter inside the surface leads to the same universal value for the entropy in the quasihorizon limit. This can be of some help in the understanding of black hole entropy. Other similarities between black holes and quasiblack holes, such as the mass formulas for both objects had been found previously. We also discuss the entropy for extremal quasiblack holes, a more subtle issue.

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