All Questions
Tagged with black-holes singularities
462
questions
66
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Do all black holes have a singularity?
If a large star goes supernova, but not enough mass collapses to form a black hole, it often forms a neutron star. My understanding is that this is the densest object that can exist because of the ...
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votes
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Why do physicists trust black hole physics?
Based on popular accounts of modern physics and black holes (articles, video lectures), I have come to understand the following:
Black holes are predicted by General Relativity, a classical theory of ...
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41
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12
answers
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What does it mean when people say "Physics break down"?
So I keep hearing people talking about how physics break down at for example the center of a black hole. And maybe I am just to stupid but, why? How can we say that? For all we know a black hole could ...
- 619
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Does any particle ever reach any singularity inside the black hole?
I am not a professional physicist, so I may say something rubbish in here, but this question has always popped in my mind every time I read or hear anyone speak of particles hitting singularities and "...
user1549
41
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4
answers
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Are black holes very dense matter or empty?
The popular description of black holes, especially outside the academia, is that they are highly dense objects; so dense that even light (as particle or as waves) cannot escape it once it falls inside ...
- 513
41
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6
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If I fall into an evaporating black hole, where do I end up?
This question has been bothering me for a while. I have a crude hypothesis...
As I understand it, an observer falling into a black hole will cross the event horizon at some specific future (proper) ...
- 527
38
votes
9
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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 ...
- 530
34
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8
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Why does Roy Kerr claim that the Kerr black hole does not contain a singularity?
In a preprint posted on the arXiv, Roy Kerr claims that there is a widespread misunderstanding related to the singularity inside the black hole that bears his name.
Can anyone explain his argument in ...
- 2,136
32
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2
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8k
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Euclidean derivation of the black hole temperature; conical singularities
I am studying the derivation of the black hole temperature by means of the Euclidean approach, i.e. by Wick rotating, compactifying the Euclidean time and identifying the period with the inverse ...
- 1,232
28
votes
1
answer
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Overcharging a black hole
Hubeny's 1998 paper got a lot of people interested in determining whether cosmic censorship can be violated by dropping too much charge onto a black hole. It suggested that you might be able to get a ...
user4552
27
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3
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If iron can’t undergo fusion, does that mean a black hole is mostly iron?
Since stellar fusion can’t progress beyond iron, and a large enough star collapsed into a black hole because an iron core stalled fusion, wouldn’t that mean all black holes are predominantly iron?
- 443
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Why exactly are singularities avoided or "deleted" in physics?
What is the real reason that make us reject singularities everytime we see them in a theory/model?
For example, in GR, it is predicted that black holes singularities have infinite density. This makes ...
- 405
26
votes
10
answers
13k
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How do black holes move if they are just regions in spacetime?
If black holes are just regions of spacetime, how can black holes even move? When matter moves through spacetime, it bends the spacetime around it, but if black holes are just regions of spacetime, ...
- 403
26
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7
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Why did the universe not collapse to a black hole shortly after the big bang?
Wasn't the density of the universe at the moment after the Big Bang so great as to create a black hole? If the answer is that the universe/space-time can expand anyway what does it imply about what ...
- 517
24
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3
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If black holes are just empty vacuum of space inside, then what causes the curvature?
I have read this question:
The fundamental confusion many have about black holes is thinking that they are discrete "things" surrounded by horizons and other phenomena. But they are ...
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