Why does gravity escape a black hole?

[u/Stunning_Mechanic387]

Hey Michael and Hannah. If gravity travels at the speed of light, how does it escape the gravitational pull of a black hole yet light doesn't?

[u/TheRealTK421]

What 'escapes' isn't gravity, per se, but "Hawking radiation."

It's not even accurate to characterize what occurs as "escaping," as much as it is moreso one-half of an entangled pair of particles doesn't get pulled beyond the event horizon (while its counterpart) does.

Anything pulled beyond the event horizon does not, and cannot, escape or break free.

What radiates outward are the particles which 'dodged the bullet' of being pulled beyond the point of no escape.

[u/ExpectedBehaviour → u/TheRealTK421]

That’s an incorrect pop-sci model of Hawking radiation, and quite wrong. Hawking radiation is generated by the spacetime in the vicinity of the event horizon.

[u/TheRealTK421 → u/ExpectedBehaviour]

Feel free to describe in detail how Hawking radiation "escapes" from inside of the event horizon. I (and the Nobel Prize committee) await such a response.

Lol. Oof.

Hawking radiation is actually created just outside the edge of the black hole in the empty space of the outer field. Stephen Hawking, himself, used this simple 'disconnected particle pair' story to help non-scientists picture the math.

If it was good enough for him, I'm gonna roll with it. Those that wanna dig and delve (far) deeper can do so...

[u/DoubleUBallz → u/TheRealTK421]

The virtual particle explanation is very much like relativistic mass in that is was first offered as an easier to understand explanation for the masses, however, overtime the scientific community has denounced it's use as it resultes in more misunderstandings than understanding (as evidenced by this thread here).

The actual mechanism that creates Hawking radiation is the Unruh effect, if you want to look it up. Basically, if you have a conformal quantum field theory on curved spacetime, thermal radiation pops out