Insensitivity of Hawking radiation to an invariant Planck-scale cutoff

Details Insensitivity of Hawking radiation to an invariant Planck-scale cutoff Insensitivity of Hawking radiation to an invariant Planck-scale cutoff

2009-06-29

arxiv.org/abs/0906.5315v1

Phys.Rev.D80:047503,2009

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

4 pages

Scientific paper

10.1103/PhysRevD.80.047503

A disturbing aspect of Hawking's derivation of black hole radiance is the need to invoke extreme conditions for the quantum field that originates the emitted quanta. It is widely argued that the derivation requires the validity of the conventional relativistic field theory to arbitrarily high, trans-Planckian scales. We stress in this note that this is not necessarily the case if the question is presented in a covariant way. We point out that Hawking radiation is immediately robust against an invariant Planck-scale cutoff. This important feature of Hawking radiation is relevant for a quantum gravity theory that preserves, in some way, the Lorentz symmetry.

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