Linked Questions

4
votes
3answers
6k views

How many dimensions does a singularity have? [duplicate]

my understanding of a singularity is that it is a 'point' in the universe with an infinite energy density. I have also read on the internet that a singularity is one-dimensional. This is a concept ...
0
votes
1answer
86 views

How can two zero-dimensional black hole singularities have different masses? [duplicate]

(This question is not a duplicate because it is primarily concerned with how different zero dimensional objects/singularities with zero volume, are able to contain differing information on black holes ...
0
votes
0answers
46 views

Black hole in timespace: point or “trench”? [duplicate]

I wonder what is the nature of a black hole as set of points of manifold. A single point (with infinite curvature) or a "trench" ? I thought that it is a "point", but since black holes can collide and ...
33
votes
8answers
6k views

Why singularity in a black hole, and not just “very dense”?

Why does there have to be a singularity in a black hole, and not just a very dense lump of matter of finite size? If there's any such thing as granularity of space, couldn't the "singularity" be just ...
20
votes
6answers
58k views

What is exactly the density of a black hole and how can it be calculated?

How do scientists calculate that density? What data do they have to calculate that?
19
votes
4answers
2k views

Intuitively, why do attempts to delay hitting a black hole singularity cause you to reach it faster?

In general relativity, proper time is maximized along geodesics. Inside of a black hole, all future-oriented timelike trajectories end at the singularity. Putting these two facts together, we find ...
10
votes
3answers
1k views

What happens if you dump antimatter into a black hole? [duplicate]

Let's say you have a 10 solar mass BH and dump 10 solar masses of antimatter into the BH... What would happen? Would I have a 20 solar mass BH? Would the BH explode Do we even understand what would ...
9
votes
2answers
3k views

What is the physical size of a black hole?

Something that's always confused me. How large is a black hole's physical size - not mass? From descriptions, it would seem that the 'singularity' is a single point, but is it really? Say for ...
8
votes
2answers
422 views

Is it possible the space-time manifold itself could stop at a black hole's event horizon?

This is a repost of a question I saw here: Could the spacetime manifold itself end at the event horizon? which was closed because it apparently didn't seem clear as to what the poster there was ...
3
votes
2answers
234 views

What is the volume inside the event horizon of a black hole?

As I understand it, we measure things like distance (and volume) by the speed of light. A meter is the distance light travels in 1/299792458 seconds. In "normal space" this is (barely) straightforward,...
0
votes
2answers
704 views

About the 1D singularity of black hole [duplicate]

I saw some responses here saying that the singularity into the black hole is one dimension object so my question is : is it possible that the singularity is simply a merger of the 4 dimensions of the ...
1
vote
1answer
212 views

Describing the shape of a singularity

Hawking and Ellis write about the difficulty of describing the shape of a singularity when presented with a manifold that has curves of finite length that don't reach a point in the manifold. [...
0
votes
1answer
132 views

Black hole's singularity: Does it has to be multi-dimensional? [closed]

We assume that there is an infinite density at the center of a black hole. But we also know that if it was really infinite, it would apply an infinite gravitational force to masses even if they were ...
2
votes
1answer
129 views

Metric diameter of a ring singularity

In the Kerr metric the ring singularity is located at the coordinate radius $r=0$, which corresponds to a ring with the cartesian radius $R=a$. So the center of the ring singularity in cartesian ...
0
votes
3answers
237 views

If a Black Hole Singularity is a 1 Dimensional Object, How Does it Affect 4 Dimensional Space

If the center of a black hole is an one-dimensional point, gravitational singularity, where density and gravity become infinite and space-time curves infinitely, then / why: If spacetime is warped ...

15 30 50 per page