Black hole ramblings

[wolfpup]

@Whack-a-Mole

@k9bfriender

We don’t see it actually cross, but that doesn’t mean that we see it just hover there either. It appears to get further and further away, and accelerate away from us at greater and greater velocity, until it is red-shifted into invisibility, effectively no longer existing on the outside of the event horizon.

This does not mean, however, that the time of a test particle dropped into the black hole stops, it just does so in relation to the outside observer.

I am curious about this.

Consider the perspective of the particle/person falling in. Time does not stop for it but it will see the rest of the universe accelerate in time…like it is in fast forward. Presumably, at the event horizon, time in the distant universe passes by so quickly the universe itself will end in an instant. If so then wouldn’t the BH also zoom out of existence?

To an outside observer all of this would take uncountable ages to happen but for you…poof.

What time then to get inside the black hole and find the singularity?

There is certainly an interesting paradox between the apparently infinite “frozen forever” time dilation at the event horizon as observed from an outside frame of reference and the fact that in the proper time of an infalling object it passes through the EH and reaches the singularity in a matter of seconds or minutes, depending on the size of the black hole. You may be interested in this thread, if you haven’t already seen it, which makes some interesting points about this paradox.

I posted some thoughts about it in posts #18 and #22. There’s also a good response by @Asympotically_fat in post #25.