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Sensitivity of Hawking radiation to superluminal dispersion relations

AutorBarceló, Carlos ; Garay, Luis Javier ; Jannes, Gil
Palabras clave[PACS] Quantum aspects of black holes, evaporation, thermodynamics
[PACS] Phenomenology of quantum gravity
[PACS] Quantum fields in curved spacetime
Fecha de publicación22-ene-2009
EditorAmerican Physical Society
CitaciónPhysical Review D 79(2): 024016 (2009)
ResumenWe analyze the Hawking radiation process due to collapsing configurations in the presence of superluminal modifications of the dispersion relation. With such superluminal dispersion relations, the horizon effectively becomes a frequency-dependent concept. In particular, at every moment of the collapse, there is a critical frequency above which no horizon is experienced. We show that, as a consequence, the late-time radiation suffers strong modifications, both quantitative and qualitative, compared to the standard Hawking picture. Concretely, we show that the radiation spectrum becomes dependent on the measuring time, on the surface gravities associated with different frequencies, and on the critical frequency. Even if the critical frequency is well above the Planck scale, important modifications still show up.
Descripción13 pages, 7 figures.-- PACS nrs.: 04.70.Dy; 04.60.Bc; 04.62.+v.-- ArXiv pre-print available at: http://arxiv.org/abs/0807.4147
Versión del editorhttp://dx.doi.org/10.1103/PhysRevD.79.024016
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