Journal of High Energy Physics

, 2011:112 | Cite as

The trans-Planckian problem as a guiding principle

  • L. C. Barbado
  • C. Barceló
  • L. J. Garay
  • G. Jannes


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.


Black Holes Models of Quantum Gravity 


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Copyright information

© SISSA, Trieste, Italy 2011

Authors and Affiliations

  • L. C. Barbado
    • 1
  • C. Barceló
    • 1
  • L. J. Garay
    • 2
    • 3
  • G. Jannes
    • 4
  1. 1.Instituto de Astrofísica de Andalucía (IAA — CSIC)GranadaSpain
  2. 2.Departamento de Física Teórica IIUniversidad Complutense de MadridMadridSpain
  3. 3.Instituto de Estructura de la Materia (IEM — CSIC)MadridSpain
  4. 4.Low Temperature LaboratoryAalto University School of ScienceAaltoFinland

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