Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2008-08-25
Phys.Lett.B673:227-231,2009
Physics
High Energy Physics
High Energy Physics - Theory
13 pages, 0 figures, revtex4, To be published PLB. Critic of detailed balance dropped and reference added which shows how deta
Scientific paper
10.1016/j.physletb.2009.02.022
In this Letter we make a critique of, and comparison between, the anomaly method and WKB/tunneling method for obtaining radiation from non-trivial spacetime backgrounds. We focus on Rindler spacetime (the spacetime of an accelerating observer) and the associated Unruh radiation since this is the prototype of the phenomena of radiation from a spacetime, and it is the simplest model for making clear subtle points in the tunneling and anomaly methods. Our analysis leads to the following conclusions: (i) neither the consistent and covariant anomaly methods gives the correct Unruh temperature for Rindler spacetime and in some cases (e.g. de Sitter spacetime) the consistent and covariant methods disagree with one another; (ii) the tunneling method can be applied in all cases, but it has a previously unnoticed temporal contribution which must be accounted for in order to obtain the correct temperature.
Akhmedova Valeria
Gill Andrea de
Pilling Terry
Singleton Douglas
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