Carlos Barceló, Raúl Carballo, Luis J. Garay
We explicitly compare the structure of the renormalized stress-energy tensor
(RSET) of a massless scalar field in a (1+1) curved spacetime as obtained by
two different strategies: normal-mode construction of the field operator and
one-loop effective action. We pay special attention to where and how it is
encoded the information related to the choice of vacuum state in both
formalisms. By establishing a clear translation map between both procedures, we
show that these two potentially different RSET are actually equal, when using
vacuum-state choices related by this map. One specific aim of the analysis is
to facilitate the comparison of results regarding semiclassical effects in
gravitational collapse as obtained within these different formalisms.
View original:
http://arxiv.org/abs/1112.0489
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