Rod falling through the event horizon of a black hole

  • I
  • Thread starter timmdeeg
  • Start date
  • #26
timmdeeg
Gold Member
1,116
82
No, it isn't. A black hole is a vacuum solution.
I avoided to say 'at the singularity' because the predictions of the vacuum solution seem to be wrong there. But even though I think it's still wrong to talk about "compression" refering to the quantum gravity regime. Most probably nobody can tell what happens to matter when it reaches the center of a black hole. And thus classical notions like 'tidal forces', 'compression' and perhaps even 'heat' or 'spacetime' might not be applicable anymore, because we don't know the state of matter under such conditiones.

I'm reasoning sometimes whether the state of matter in the center of a black hole should't be similar to what one would expect for the state of matter in the early universe prior to inflation as it seems that matter (whatever this means in terms of quantum gravity, matter in the classical sense has existed before and during the gravitational collapse has happened and after inflation) is within a very small volume in both cases. But am not sure at all, if this makes sense.
 
  • #27
PeterDonis
Mentor
Insights Author
2019 Award
31,621
10,369
I avoided to say 'at the singularity' because the predictions of the vacuum solution seem to be wrong there.
That is the opinion of most physicists, yes. More precisely, most physicists believe that classical GR breaks down when spacetime curvature gets large enough, as it does when you get close enough to the singularity in the Schwarzschild black hole solution.

Most probably nobody can tell what happens to matter when it reaches the center of a black hole.
We currently don't know, if classical GR breaks down near the singularity, what theory should replace it. Most physicists believe it will be some sort of quantum gravity theory, but we don't know which one.

And thus classical notions like 'tidal forces', 'compression' and perhaps even 'heat' or 'spacetime' might not be applicable anymore, because we don't know the state of matter under such conditiones.
That's possible, yes.

I'm reasoning sometimes whether the state of matter in the center of a black hole should't be similar to what one would expect for the state of matter in the early universe prior to inflation
That's possible too, yes. We won't know until we figure out the correct theory under these conditions.
 
  • Like
Likes timmdeeg
  • #28
timmdeeg
Gold Member
1,116
82
PeterDonis, thanks for commenting ,so let's wait.
 

Related Threads on Rod falling through the event horizon of a black hole

  • Last Post
Replies
4
Views
4K
  • Last Post
Replies
16
Views
3K
  • Last Post
Replies
11
Views
6K
Replies
6
Views
1K
Replies
99
Views
20K
Replies
142
Views
22K
Replies
12
Views
2K
Replies
3
Views
890
Replies
1
Views
766
Replies
16
Views
2K
Top