The trans-Planckian problem as a guiding principle

Details The trans-Planckian problem as a guiding principle The trans-Planckian problem as a guiding principle

2011-09-16

arxiv.org/abs/1109.3593v2

JHEP 11, 112 (2011)

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

20 pages, 4 figures. v2: minor clarifications. Published version

Scientific paper

10.1007/JHEP11(2011)112

We use the avoidance of the trans-Planckian problem of Hawking radiation as a guiding principle in searching for a compelling scenario for the evaporation of black holes or black-hole-like objects. We argue that there exist only three possible scenarios, depending on whether the classical notion of long-lived horizon is preserved by high-energy physics and on whether the dark and compact astrophysical objects that we observe have long-lived horizons in the first place. Along the way, we find that (i) a theory with high-energy superluminal signalling and a long-lived trapping horizon would be extremely unstable in astrophysical terms and that (ii) stellar pulsations of objects hovering right outside but extremely close to their gravitational radius can result in a mechanism for Hawking-like emission.

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