Hessling's Quantum Equivalence Principle and the Temperature of an Extremal Reissner-Nordstr\"om Black Hole
Abstract
The Hessling improvement of the Haag, Narnhofer and Stein principle is analysed in the case of a massless scalar field propagating outside of an extremal R-N black hole. It is found that this sort of ``Quantum (Einstein's) Equivalence Principle'' selects only the R-N vacuum as a physically sensible state, i.e., it selects the temperature T=0 only.
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