B Black hole evaporation mechanism

  • B
  • Thread starter Thread starter Gingerot
  • Start date Start date
Gingerot
Messages
1
Reaction score
0
Evaporation of a black hole by Hawking radiation defies common sense. Let us assume that a vacuum fluctuation leads to the birth of an electron-positron pair, with an electron being born below the event horizon and a positron above the event horizon. The positron flies away to infinity. But the electron falls into the central singularity. In this case, there is an increase in mass in the singularity! How is this process related to the “evaporation” of a black hole? The mass at the singular point increases.
 
Physics news on Phys.org
Gingerot said:
with an electron being born below the event horizon and a positron above the event horizon. The positron flies away to infinity
Don't you think that's a bit naive ?

##\ ##
 
Gingerot said:
How is this process related to the “evaporation” of a black hole?
It isn’t. You’ll see Hawking radiation described that way in the popular press, but that’s not what’s really going on and it will confuse you if you take it too seriously.
 
from the original paper on what is now called Hawking Radiation:

(in talking about the particle-pair description): It should be emphasized that these pictures of the mechanism responsible for the thermal emission and area decrease are heuristic only and should not be taken too literally.
 
  • Like
Likes vanhees71 and Vanadium 50
@Gingerot
There is no good math-free way of describing how Hawking radiation works, which is why so many pop-sci writers fall back on the misleading “explanation” you’ve seen.

The process can be described as negative energy falling into the black hole while positive energy escapes out to infinity, but that’s not a complete either. You will get some help from here and you can get the real thing from Hawking himself here.
 
Last edited:
  • Like
Likes vanhees71, berkeman, BvU and 1 other person
Thread 'Can this experiment break Lorentz symmetry?'
1. The Big Idea: According to Einstein’s relativity, all motion is relative. You can’t tell if you’re moving at a constant velocity without looking outside. But what if there is a universal “rest frame” (like the old idea of the “ether”)? This experiment tries to find out by looking for tiny, directional differences in how objects move inside a sealed box. 2. How It Works: The Two-Stage Process Imagine a perfectly isolated spacecraft (our lab) moving through space at some unknown speed V...
Does the speed of light change in a gravitational field depending on whether the direction of travel is parallel to the field, or perpendicular to the field? And is it the same in both directions at each orientation? This question could be answered experimentally to some degree of accuracy. Experiment design: Place two identical clocks A and B on the circumference of a wheel at opposite ends of the diameter of length L. The wheel is positioned upright, i.e., perpendicular to the ground...
According to the General Theory of Relativity, time does not pass on a black hole, which means that processes they don't work either. As the object becomes heavier, the speed of matter falling on it for an observer on Earth will first increase, and then slow down, due to the effect of time dilation. And then it will stop altogether. As a result, we will not get a black hole, since the critical mass will not be reached. Although the object will continue to attract matter, it will not be a...
Back
Top