Entropy of an extremal regular black hole

被引：21
作者：
Myung, Yun Soo [1 ,2 ]
Kim, Yong-Wan [1 ,2 ]
Park, Young-Jai [3 ,4 ]
机构：
[1] Inje Univ, Inst Math Sci, Gimhae 621749, South Korea
[2] Inje Univ, Sch Comp Aided Sci, Gimhae 621749, South Korea
[3] Sogang Univ, Dept Phys, Seoul 121742, South Korea
[4] Sogang Univ, Ctr Quantum Spacetime, Seoul 121742, South Korea
来源：
PHYSICS LETTERS B | 2008年 / 659卷 / 04期
基金：
新加坡国家研究基金会;
关键词：
regular black hole; nonlinear electrodynamics; entropy;
D O I：
10.1016/j.physletb.2007.12.007
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
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) x 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-Norstrom 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. (C) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码：832 / 838
页数：7
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