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arXiv 0705.2478gr-qchep-th
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极值正则黑洞的熵

Entropy of an extremal regular black hole

Yun Soo Myung, Yong-Wan Kim, Young-Jai Park

摘要:

在Einstein引力与非线性电动力学耦合系统中引入了一个磁荷极值正则黑洞。它的近地平线几何形状由$AdS_2\times S^2$给出。事实证明,熵函数方法不会自动导致贝肯斯坦-霍金熵的正确熵。这与爱因斯坦-麦克斯韦理论中的极端Reissner-Norström黑洞的情况形成对比。我们的结论是,熵函数的方法不工作的磁荷极规则黑洞没有奇异性,因为熵函数的非线性。

英文摘要:

We introduce a magnetically charged extremal regular black hole in the coupled system of Einstein gravity and nonlinear electrodynamics. Its near horizon geometry is given by $AdS_2\times S^2$. It turns out that the entropy function approach does not automatically lead to a correct entropy of the Bekenstein-Hawking entropy. This contrasts to the case of the extremal Reissner-Norström black hole in the Einstein-Maxwell theory. We conclude that the entropy function approach does not work for a magnetically charged extremal regular black hole without singularity, because of the nonlinearity of the entropy function.

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