Germani, CristianoSarkar, Debajyoti2020-06-252020-06-252015-10-230015-8208https://hdl.handle.net/2445/166603In 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.13 p.application/pdfeng(c) Wiley-VCH Verlag, 2015Forats negres (Astronomia)Teoria quàntica de campsCosmologia quànticaBlack holes (Astronomy)Quantum field theoryQuantum cosmologyinfo:eu-repo/semantics/article6572402020-06-25info:eu-repo/semantics/openAccess