4 ms·
I suggest reading https://www.forbes.com/sites/startswithabang/2018/11/03/ask-ethan-how-do-black-holes-actually-evaporate/ https://www.forbes.com/sites/startsw
by acqq 6y ago
I suggest reading
https://www.forbes.com/sites/startswithabang/2018/11/03/ask-ethan-how-do-black-holes-actually-evaporate/ https://www.forbes.com/sites/startswithabang/2018/11/03/ask-...
Most importantly, he argues that Hawking's own popular explanation (often repeated across the media, about the particle-antiparticle pair) is too simple to be correct:
"It's not right, though, in a number of ways. First off, this visualization is not for real particles, but virtual ones. We are trying to describe the quantum vacuum, but these are not actual particles that you can scoop up or collide with. The particle-antiparticle pairs from quantum field theory are calculational tools only, not physically observable entities. Second, the Hawking radiation that leaves a black hole is almost exclusively photons, not matter or antimatter particles. And third, most of the Hawking radiation doesn't come from the edge of the event horizon, but from a very large region surrounding the black hole."
Additionally, the article also writes enough to explain the whole context and gives enough details for those who are interested to learn more.
- flubert 6y agoI wonder how charge evaporates from a charged black hole? And does it do so at a rate that is different from the mass? i.e. does most of the mass evaporate away, and then the charge?
- tzs 6y agoThat seems to be an open question. Hawking radiation is not charged, but it also turns out that there is a maximum amount of charge a black hole of a given mass can have, and the lower the mass the lower the maximum allowed charge. So it would seem that a charged black hole would evaporate by Hawking radiation until it reached the point where any further mass loss would put it over the charge limit. Physicists don’t think it is then simply going to stop radiating, and so what happens then is I believe still quite open. There was an article in Quanta a few months ago on this: https://www.quantamagazine.org/black-hole-paradoxes-reveal-a-fundamental-link-between-energy-and-order-20200528/ https://www.quantamagazine.org/black-hole-paradoxes-reveal-a...
- flubert 6y agoThanks. I also found: https://physics.stackexchange.com/questions/490524/evaporation-of-large-charged-black-holes https://physics.stackexchange.com/questions/490524/evaporati...