WittyUnwittingly t1_j27dpjt wrote on December 30, 2022 at 4:22 AM

Reply to comment by Impossible_Pop620 in Black hole question by Impossible_Pop620

Well I think the issue is that the event horizon is not a thing to be moved or deformed. You can deform spacetime, which necessarily deforms your event horizon, but everything else (the origin of your pulse, for example) is also sitting at a specific point in spacetime, which is now deformed.

But also, from the perspective of "the inside" of the event horizon, there would be no direction you could choose that would take you out. It's less about something really strong pulling you backward, and more like reality itself has warped to the point of isolating you from the outside universe. What direction do you point your signaling device, when no direction is "outward?"

senormonje t1_j28rk2l wrote on December 30, 2022 at 1:48 PM

Strange. In that case does being inside the event horizon isolate a given piece of matter (prior to becoming part of the singularity) from outside gravitational influences, no matter how strong... even another black hole? Is this because of the propagation speed of gravity?

WittyUnwittingly t1_j29rhr0 wrote on December 30, 2022 at 5:55 PM

As far as I know, everything, once it crosses the event horizon, is causally disconnected from the exterior. (I. E. There is nothing you can do from the outside, that will affect the inside)

I don't think any special physics are required to explain this other than general relativity. Any changes you make to a black hole cannot fully manifest until the end of the universe. So I guess you COULD gravitationally distort an event horizon, but from the perspective of someone inside, the distortion happens at the same time as everything else (which is all happening at once) at the end of the universe.