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Paper detail

Two formalisms, one renormalized stress-energy tensor

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.

preprint2012arXivOpen access
Carlos BarcelóRaúl CarballoLuis J. Garay
gr-qc
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Carlos BarcelóRaúl CarballoLuis J. Garay

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