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Paper   IPM / Astronomy / 12885
School of Astronomy
  Title:   Conformally rescaled spacetimes and Hawking radiation
  Author(s): 
1.  Alex B Nielsen
2.  Javad Taghizadeh Firouzjaee
  Status:   To Appear
  Journal: General Relativity and Gravitation
  Supported by:  IPM
  Abstract:
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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