Can Hawkings Radiation really happen?
Recovered historical discussion from Can Hawkings Radiation really happen?.
How can a particle cross the EH in real time ( from the perspective of an external observer)? If it cant then HR is not possible.
Archived source: https://web.archive.org/web/20100218172814/http://www.spacetimeandtheuniverse.com:80/against-mainstream/3333-can-hawkings-radiation-really-happen.html#post6285
Replies
PhysicsNard
Hawking radiation is exactly that -- radiation. (simplistically) The radiation doesn't cross the event horizon. What happens is that a quantum fluctuation allows a particle inside the event horizon to temporarily cross the horizon, emit the radiation, and then cross back. You have to understand that GR is a purely classical theory and there have to be quantum modifications of GR results. The fluctuation that allows the (virtual) particle to cross over and then back is typical of quantum fluctuations in many physical processes.
Tom
Quote:
Originally Posted by
PhysicsNard
Hawking radiation is exactly that -- radiation. (simplistically) The radiation doesn't cross the event horizon. What happens is that a quantum fluctuation allows a particle inside the event horizon to temporarily cross the horizon, emit the radiation, and then cross back. You have to understand that GR is a purely classical theory and there have to be quantum modifications of GR results. The fluctuation that allows the (virtual) particle to cross over and then back is typical of quantum fluctuations in many physical processes.
mmmm ... so it crosses the EH? but then it must travel at faster than the speed of light to escape right?