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Title: | Firewalls as artefacts of inconsistent truncations of quantum geometries |
Author: | Germani, Cristiano Sarkar, Debajyoti |
Keywords: | Forats negres (Astronomia) Teoria quàntica de camps Cosmologia quàntica Black holes (Astronomy) Quantum field theory Quantum cosmology |
Issue Date: | 23-Oct-2015 |
Publisher: | Wiley-VCH Verlag |
Abstract: | In this paper we argue that a firewall is simply a manifestation of an inconsistent truncation of non-perturbative effects that unitarize the semiclassical black hole. Namely, we show that a naive truncation of quantum corrections to the Hawking spectrum at order O(e−S), inexorably leads to a 'localised'' divergent energy density near the black hole horizon. Nevertheless, in the same approximation, a distant observer only sees a discretised spectrum and concludes that unitarity is achieved by O(e−S) effects. This is due to the fact that instead, the correct quantum corrections to the Hawking spectrum go like O(gtte−S). Therefore, while at a distance far away from the horizon, where gtt≈1, quantum corrections {\it are} perturbative, they {\it do} diverge close to the horizon, where gtt→∞. Nevertheless, these 'corrections' nicely re-sum so that correlations functions are smooth at the would-be black hole horizon. Thus, we conclude that the appearance of firewalls is just a signal of the breaking of the semiclassical approximation at the Page time, even for large black holes. |
Note: | Versió postprint del document publicat a: https://doi.org/10.1002/prop.201500057 |
It is part of: | Fortschritte der Physik-Progress of Physics, 2015, vol. 64, num. 1, p. 131-143 |
URI: | http://hdl.handle.net/2445/166603 |
Related resource: | https://doi.org/10.1002/prop.201500057 |
ISSN: | 0015-8208 |
Appears in Collections: | Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB)) Articles publicats en revistes (Física Quàntica i Astrofísica) |
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657240.pdf | 1.12 MB | Adobe PDF | View/Open |
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