An obstruction to the implementation of spatially flat Painlevé-Gullstrand (PG) slicings is demonstrated, and explicitly discussed for Reissner-Nordström and Schwarzschild-anti-deSitter spacetimes. Generalizations of PG slicings which are not spatially flat but which remain regular at the horizons are introduced. These metrics can be obtained from standard spherically symmetric metrics by physical Lorentz boosts. With these generalized PG metrics, problematic contributions to the imaginary part of the action in the Parikh-Wilczek derivation of Hawking radiation due to the obstruction can be avoided.
|Number of pages||3|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|Publication status||Published - 2009 Feb 2|
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics