Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2008-09-09
Class.Quant.Grav.26:155018,2009
Physics
High Energy Physics
High Energy Physics - Theory
Latex, 9 paages; v2 published version
Scientific paper
10.1088/0264-9381/26/15/155018
Hawking radiation is an important quantum phenomenon of black hole, which is closely related to the existence of event horizon of black hole. The cosmological event horizon of de Sitter space is also of the Hawking radiation with thermal spectrum. By use of the tunneling approach, we show that there is indeed a Hawking radiation with temperature, $T=1/2\pi \tilde r_A$, for locally defined apparent horizon of a Friedmann-Robertson-Walker universe with any spatial curvature, where $\tilde r_A$ is the apparent horizon radius. Thus we fill in the gap existing in the literature investigating the relation between the first law of thermodynamics and Friedmann equations, there the apparent horizon is assumed to have such a temperature without any proof. In addition, we stress the implication of the Hawking temperature associated with the apparent horizon.
Cai Rong-Gen
Cao Li-Ming
Hu Ya-Peng
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