All Questions
14
questions
17
votes
1
answer
1k
views
Can a Kerr black hole become super-extremal?
Let's assume there is a large Kerr black hole, which is almost
extremal and would become extremal with the addition of a small
amount of mass $M$ with spin $J$ to make the final $J=M$.
What if this ...
- 751
5
votes
2
answers
151
views
Is the Schwarzschild singularity a limit of the Kerr singularity?
In a Schwarzschild black hole, the singularity is spacelike. In a Kerr black hole, it is timelike.
Is there any continuous transformation between those solutions? Can the Schwarzschild solution be ...
- 203
3
votes
1
answer
125
views
What is spinning in a spinning black hole? [duplicate]
When a rotating star collapses into a neutron star, the resulting object spins at a huge number of rpm due to its much smaller volume and the conservation of angular momentum. What happens when a ...
- 31
1
vote
0
answers
249
views
Does the angular momentum of a Black Hole give insight into a potential solution for the singularity?
Alright so, i want to make one thing clear. I am a bit of a dumbass who watches a lot of PBS Spacetime and read a paper or to on visualising Black Holes. Example image (10k):
I asked a very similar ...
- 308
1
vote
0
answers
35
views
Could the spin of a Black Hole give us insight into the size of the core? [closed]
As we know the conservation of angular momentum seems to be rather true and applies to black holes as well. We know that they spin and we also know the relationship between angular velocity and radius....
- 308
2
votes
1
answer
154
views
What is the problem with a rotating singularity?
In most cases, people ask how can a point spin, resulting in a 'ringularity' as an answer. But I'm not quite sure why a point can't spin. After all, it's like saying how can something with mass have ...
- 2,650
0
votes
0
answers
55
views
How is rotational information transferred to a singularity? [duplicate]
If some mass spirals into a black hole the conservation of angular momentum means that the result will have to spin (at least to my albeit limited understanding). But if the singularity is a point, ...
- 2,650
0
votes
1
answer
42
views
What is the physical shape of a rapidly spinning singularity?
Let's say I have a star 20x the mass of the sun. At the end of its life, it collapses into a black hole. Now correct me if I am wrong, but as it collapses it rotational speed dramatically increases ...
- 2,706
1
vote
0
answers
29
views
How can black hole rotate? [duplicate]
I was reading about black holes and I've found part saying that black hole is a point and anther saying that black hole can rotate. However the points are dimensionless, so they can't rotate - How can ...
- 123
3
votes
1
answer
151
views
Black Hole rotation and acceleration
I have been reading some about the black holes and the rotation about it, and have also heard about the fastest spinning black hole (NGC 1365), which as I understand, its rotation is 86% the speed of ...
- 107
0
votes
0
answers
51
views
What does that mean, a black hole "rotates"? [duplicate]
A black hole has:
a mass
electrical charge
angular momentum?
In the inner, there is a singularity, all the mass, collapsed to one point.
The event horizon is surrounding that singularity.
How can a ...
- 101
4
votes
1
answer
645
views
How can black holes have electric charge and spin? [duplicate]
If the star's mass supposedly collapses into a single point, and it ends up having "said" zero volume, then how can people say that the hole has a specific spin or that it can have an angular momentum?...
- 1,847
5
votes
2
answers
2k
views
Rotating black holes and naked singularity
In the book The science of interstellar by Kip thorne can be found the following:
There is a maximum spin rate that any black hole can have. If it spins faster than that maximum, its horizon ...
20
votes
4
answers
8k
views
How can a singularity in a black hole rotate if it's just a point?
I guess nobody really knows the true nature of black holes, however, based on everything I know about black holes, there is a "singularity" at their center, which has finite mass but is infinitely ...
- 912