Linked Questions

4
votes
2answers
152 views

Could all matter in a black hole be actually only on its surface (Schwarzschild radius)?

Layman here, sorry if I miss something obvious. Black hole entropy depends linearly on its surface. If all matter in a black hole would actually be located only on its surface (or very near), wouldn'...
2
votes
3answers
191 views

Does it actually take infinite (observer) time for someone to fall into a black hole?

If you were to watch your friend approach a black hole, I understand that you'd see their clock slow until they appear frozen and redshift within a few seconds. But if you were to detect the ...
1
vote
2answers
231 views

Free falling observer's description of object falling past the event horizon

I know that to a hypothetical observer infinitely far away from the black hole (sometimes known as the Schwarzchild observer), all in falling objects appear to "slow down and asymptotically freeze" at ...
6
votes
0answers
282 views

Aren't black holes required to exist forever in our frame of reference?

I know that for an observer far away, nothing ever crosses a black hole horizon (due to time dilation), while in the frame of reference of a falling observer the horizon is nothing special on its way ...
3
votes
1answer
105 views

Where is the black hole information paradox?

If an object falls into a Schwarzschild black hole and a distant observer watches, they see the object fall slower and slower as it approaches the event horizon, until it is "frozen." (To the observer,...
0
votes
1answer
81 views

Black hole surrounding an object?

When a particle crosses the event horizon of a black hole, at one short moment in time would it appear for that particle as if it was surrounded by a black hole? Regardless of which direction you ...
5
votes
1answer
103 views

Does the maximally-extended Schwarzschild horizon see the entire past of the parallel universe?

I've seen similar discussions for the inner horizons of Kerr and Reissner-Nordstöm metrics, but I've never seen mention for the simple maximally extended Schwarzschild geometry: As an infalling ...
0
votes
1answer
215 views

Falling into a black hole doesn't reveal the future, but does that mean it's not happening?

In a previous answer it was said that you wouldn't see the universe speed up as you fell into a black hole, which I accept as true. However, is being unable to see or interact with the outside ...
-1
votes
1answer
93 views

Does the twin paradox ensure the quantum unitarity near a black hole?

A quantum system of two entangled particles is located near a black hole, particle A is receding from and particle B is moving towards the event horizon. When particle B is crossing the event horizon,...
3
votes
2answers
89 views

Can a black hole event horizon form before the singularity for an outside observer?

This is not a duplicate, my question is not about whether BHs have or don't have a singularity, but my question is whether, because of time dilation, no matter has reached the center and formed a ...
1
vote
0answers
111 views

How can matter reach the singularity of a black hole if time stops at the event horizon? [duplicate]

Black holes are said to be composed of two parts: A singularity at the center, where all the mass of the black hole is condensed in a point of zero volume. A black and empty ball delimited by the ...
1
vote
0answers
67 views

Can matter actually cross the event horizon effectively falling into a Black hole? [duplicate]

The answers I have seen do not take into effect the growth of the radius of the event horizon as significant amounts of matter get close to the existing event horizon. I would have expected that ...
1
vote
0answers
67 views

The nature of event horizons

I am a layman, so I'm not completely up on the latest black hole theories. However, I have been thinking about how an event horizon can be be penetrated by matter outside of the event horizon. Now, ...

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