Extremal Limits and Black Hole Entropy

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Extremal Limits and Black Hole Entropy

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Title: Extremal Limits and Black Hole Entropy
Author: Randall, Lisa; Johnson, Matthew; Carroll, Sean

Note: Order does not necessarily reflect citation order of authors.

Citation: Carroll, Sean, Matthew C. Johnson, and Lisa Randall. 2009. Extremal limits and black hole entropy. Journal of High Energy Physics 2009(11): 109.
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Abstract: Taking the extremal limit of a non-extremal Reissner-Nordstrom black hole (by externally varying the mass or charge), the region between the inner and outer event horizons experiences an interesting fate--while this region is absent in the extremal case, it does not disappear in the extremal limit but rather approaches a patch of \(AdS_2 \times S^2\). In other words, the approach to extremality is not continuous, as the non-extremal Reissner-Nordstrom solution splits into two spacetimes at extremality: an extremal black hole and a disconnected \(AdS\) space. We suggest that the unusual nature of this limit may help in understanding the entropy of extremal black holes.
Published Version: doi:10.1088/1126-6708/2009/11/109
Other Sources: http://arxiv.org/abs/0901.0931
Terms of Use: This article is made available under the terms and conditions applicable to Open Access Policy Articles, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#OAP
Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:8015828
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