Rotating Black Hole Entropy from Two Different Viewpoints

Details Rotating Black Hole Entropy from Two Different Viewpoints Rotating Black Hole Entropy from Two Different Viewpoints

2008-11-20

arxiv.org/abs/0811.3294v5

Class.Quant.Grav.26:155011,2009

Physics

High Energy Physics

High Energy Physics - Theory

LaTeX 18 pages, 2 figures, Minor modifications in section 3(ZAMO)

Scientific paper

10.1088/0264-9381/26/15/155011

Using the brick-wall method, we study the entropy of Kerr-Newman black hole from two different viewpoints, a rest observer at infinity and zero angular momentum observer near horizon. We investigate this with scalar field in the canonical quantization approach. An observer at infinity can take one of the two possible frequency ranges; one is with positive frequencies only and the other is with the whole range including negative frequencies. On the other hand, a zero angular momentum observer near horizon can take positive frequencies only. For the observer at infinity the superradiant modes appear in either choice of the frequency ranges and the two results coincide. For the zero angular momentum observer superradiant modes do not appear due to absence of ergoregion. The resulting entropies from the two viewpoints turn out to be the same.

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