What kind of time reversal takes place inside the event horizon of black holes?

Answer 1

Here's an excerpt from from Gravitation by Milner, Wheeler, and Thorne:

The figure shows the spacetime diagram of an object falling into a black hole. As measured with our rods and clocks we see that it takes an infinite length of time for the object to cross the event horizon at [...] Coming out of the mathematics of General Relativity is the worldline of the object inside the event horizon: apparantly it crosses the event horizon at time t = infinity, and then travels backwards in time to finally crash into the singularity at [...]

The link is a clearer explanation of what happens with time. What's hard for people to understand is that past the event horizon, time and space reverse roles, as explained by another excerpt:

On my worldline as I fall into the black hole, it turns out that the Schwarzschild coordinate called t goes to infinity when I go through the event horizon. That doesn't correspond to anyone's proper time, though; it's just a coordinate called t. In fact, inside the event horizon, t is actually a spatial direction, and the future corresponds instead to decreasing r. It's only outside the black hole that t even points in a direction of increasing time. In any case, this doesn't indicate that I take forever to fall in, since the proper time involved is actually finite.

Answer 2

First you should understand that at this time science has no way to know exactly what goes on beyond the event horizon of a black hole. However, according to Einstein's relativity, the farther you go beyond the event horizon the slower will time APPEAR to move as observed from outside the event horizon. Theoretically, at dead center of a black hole time would APPEAR to stop from the viewpoint of an external observer.

Answer 3

If a black hole could exist time would still run the same way but any object that penetrated the event horizon would have to exceed the speed of light,which cannot be done!

Answer 4

Reversal may not be accurate, it's more like time alteration. We don't know because we lack the capacity to study a black hole primarily.
The greatest minds of our time just make educated guesses about it, and the guesses are pretty thin.

Answer 5

None.