The Trans-Planckian problem as a guiding principle
Sep, 2011
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Abstract: (arXiv)
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.Note:
- 20 pages, 4 figures. v2: minor clarifications. Published version
- Hawking radiation
- trans-Planckian problem
- black hole mimickers
- modified dispersion relations
- black hole: evaporation
- radiation: Hawking
- black hole: stability
- horizon
- dispersion relation: deformation
- dispersion relation: superluminal
References(46)
Figures(4)