Hawking radiation, the Stefan-Boltzmann law, and unitarization · HackerPapers discussions

Hawking radiation, the Stefan-Boltzmann law, and unitarization — mentioned by raattgift

Sun, 17 Mar 2024 15:42:10 GMT

> Hawking radiation is due to process outside the black hole. Hm, yes, the Hawking quanta originate outside the event horizon, and not very nearby outside either (Giddings 2015 <https://arxiv.org/abs/1511.08221>, Unruh "Dumb Holes" 2007 <http://pos.sissa.it/cgi-bin/reader/conf.cgi?confid=43>). However it's best to think of "the black hole" as the entire spacetime (in Hawking's 1974 treatment and similar; or alternatively out to somewhere in the asymptotic flatness), in which there are two regions without a horizon, one to the past of the event horizon formation, and one to the future of final…

Paper and discussion history. A mention is not an endorsement.

Hawking radiation, the Stefan-Boltzmann law, and unitarization — mentioned by raattgift

Sun, 26 Feb 2023 15:23:42 GMT

> I'm sure it's wrong in important ways I'm afraid so. I'll just pick on two important ways found in one of your key sentences, and I'll stick to widely accepted results from Hawking, Unruh, Gibbons and Giddings. > Particles at the edge of the sphere are able to leak back into the parent universe via Hawking radiation just like our galaxies at great distance slip out of our universe red-shifted faster than the speed of light. Firstly, Hawking radiation doesn't leak anything out of the black hole itself; it's produced by interactions between the outside matter fields and the dynamical…

Paper and discussion history. A mention is not an endorsement.

Hawking radiation, the Stefan-Boltzmann law, and unitarization — mentioned by raattgift

Tue, 30 Oct 2018 15:56:52 GMT

> more response than I was expecting, thank you. You're welcome. > evaporating black hole must be leaking its information to somewhere The information about the contents of the BH during its formation and growth is in the region of strong gravity. Classically, it's squashed into the gravitational singularity; fully classically the singularity is always hidden behind an event horizon, so it does no harm to predicting events outside the horizon. However, we now add a quantum field theory to the picture. The origin of Hawking radiation is the acceleration between observers before the formation…

Paper and discussion history. A mention is not an endorsement.

Hawking radiation, the Stefan-Boltzmann law, and unitarization — mentioned by raattgift

Mon, 01 Oct 2018 20:14:59 GMT

> But there's nothing that stops it, say, eating protons and spitting out positrons later Oh, I see what you mean, but it's not clearly because of symmetries breaking inside the horizon, rather than high-energy pairs taking energy from the background. Semiclassically: collapse an isolated star (here we depart from Hawking's formalism), and observe nothing but photons (with wavelengths comparable to the curvature radius) forming an atmosphere densest around ~ 3m \lt r \lessapprox 4m until m is very small, at which point you'll observe pair production in the atmosphere densest around ~ 4m.…

Paper and discussion history. A mention is not an endorsement.