All Questions
10
questions
0
votes
1
answer
150
views
Black holes, singularities and topology in relativity
General relativity is defined on a base manifold which, viewed as a topological space, is simply connected (which means there's no holes). However, we know that inside a black hole there's a ...
- 309
5
votes
4
answers
465
views
Topologically, is a curvature singularity just a hole?
Topologically speaking, a hole can be introduced into a manifold and it will still be a manifold, e.g. remove points within a 2-sphere of some radius from the cartesian plane and you'll still have a ...
- 2,749
3
votes
3
answers
1k
views
Does the physical singularity of the Reissner-Nordstrom metric have a ring structure?
The physical singularity of the Kerr metric has a ring structure due to the axi-symmetric nature of the metric.
The Reissner-Nordstrom metric is the solution for a non-spinning, electrically charged ...
- 2,749
4
votes
0
answers
221
views
Merging black holes: from two singularities to a ring singularity?
In rotating black holes, the singularity is believed to be a ring or torus, unlike the single-point singularity of a non-rotating black hole.
Topological change - Imagine we have two distant black ...
- 71
2
votes
1
answer
66
views
Black hole atlases
What sort of atlases of spaces that contain a black hole (that is, including the space inside the event horizon), if any, are there? Does the central singularity have to be excluded? Are there atlases ...
- 8,833
7
votes
2
answers
789
views
What are the topological properties of a Schwarzschild black hole, and of its horizon and singularity?
What is the topology of a black hole spacetime? What about its horizon and its singularity?
user4552
3
votes
2
answers
347
views
What is the singularity of an actual collapsing black hole?
In most general relativity texts, the singularity is treated as a point removed from the manifold, to avoid having to deal with the infinite curvature of the Ricci scalar.
But in the case of a more ...
- 16.5k
1
vote
1
answer
405
views
Is a black hole really a hole in space? [closed]
What if when a supernova occurs, instead of it condensing into a singularity it creates enough force to tear a hole into the fabric of space? Is a black hole just what is sounds like, a hole in space?
10
votes
3
answers
14k
views
What is the shape of a black hole?
I was thinking; what shape does a black hole have?. By 'Shape', I mean its form (e.g, circle , cylinder, sphere, torus, etc..).
We usually think of black holes as if they're plugholes (e.g, a flat ...
- 235
8
votes
1
answer
3k
views
Geometry inside the event horizon
I'm trying to understand intuitively the geometry as it would look to an observer entering the event horizon of a Schwarszchild black hole. I would appreciate any insights or corrections to the above.
...
- 2,299