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Paper   IPM / P / 12533
School of Physics
  Title:   Conformally Rescaled Spacetimes and Hawking Radiation
1.  A.B. Nielsen
2.  J. T. Firouzjaee
  Status:   Preprint
  Year:  2012
  Supported by:  IPM
We study various derivations of Hawking radiation in conformally rescaled metrics. We focus on two important properties, the location of the horizon under a conformal transformation and its associated temperature. We find that the production of Hawking radiation cannot be associated in all cases to the trapping horizon because its location is not invariant under a conformal transformation. We also find evidence that the temperature of the Hawking radiation should transform simply under a conformal transformation, being invariant for asymptotic observers in the limit that the conformal transformation factor is unity at their location.

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