Questions tagged [singularity]
Questions regarding a point in space-time where matter is infinitely dense.
36
questions
18
votes
1
answer
2k
views
Are Buckyball-sized black holes possible?
The first item is the basic question; the subsequent items build upon it if it's possible. If these need to be broken into separate questions, I can do that, but they're pretty tightly related.
Is a ...
- 283
10
votes
6
answers
3k
views
Are black holes really singularities?
Can't black holes just be super dense objects? They could still be black (having the color of black never really required special physics, after all) and have a really strong gravitational field. If ...
- 253
9
votes
6
answers
3k
views
Black hole without singularity?
My question is about the equivalence about having an event horizon and having a singularity.
In one side the implication looks pretty obvious:
A singularity implies having an event horizon and ...
- 221
6
votes
2
answers
4k
views
How can a singularity actually exist?
Probably a stupid question, but it "bothers" me and I can't find a concrete answer on the internets.
When you fall into a black hole, afaik, time slows down for the matter falling in as it gets ...
- 63
5
votes
1
answer
3k
views
What is a "Gentle Giant" Black Hole?
I have seen articles about the Milky Way's "gentle giant" black hole. For example:
https://nypost.com/2022/05/12/image-of-gentle-giant-black-hole-at-milky-ways-center/
https://www.reuters....
user52213
5
votes
1
answer
360
views
Velocity of ringularity
How fast is a ringularity1 spinning? Spinning black holes are created from spinning stars.
The angular momentum of the 'parent' star must be conserved so spinning black holes are spinning much much ...
- 365
3
votes
0
answers
64
views
Does General Relativity predict anything about the creating of a singularity, once enough matter collapses inward to form an event horizon?
Ignoring quantum gravity, which we don't know much about, current theory (GR) states that an event horizon forms when there is enough matter/energy density to create it, and logically, a singularity I ...
- 1,022
2
votes
2
answers
1k
views
Singularities/ringularities and their properties
A black hole contains a singularity at its center. It is a zero-dimensional point, and it's where all its mass is located. So, my first question is:
If a singularity contains all a black hole's mass,...
- 1,862
2
votes
1
answer
1k
views
Do black hole singularities actually merge?
new questioner here so please be gentle.
Do the singularities of merging black holes actually merge together? I mean there are 2 infinitely small objects (singularities) that are trying to find each ...
- 21
2
votes
1
answer
78
views
Are there non-smooth metrics for spacetime (that don't involve singularities)?
I found this statement in a discussion about the application of local Lorentz symmetry in spacetime metrics:
Lorentz invariance holds locally in GR, but you're right that it no longer applies ...
- 927
2
votes
1
answer
629
views
How can a naked singularity be possible?
How can we have a singularity, without a black hole around it? How would one form? What does it do?
- 667
2
votes
0
answers
102
views
What exactly IS a "Domain Wall"?
A Domain Wall is an "topological defect" and a 2-dimensional singularity. They are widely theorized to exist throughout the universe, but none have been detected yet. I'm having trouble ...
- 121
1
vote
1
answer
3k
views
What created the big bang's singularity?
I have heard theories for the big bang like: of another universe existing before the Big Bang, or an unstable white hole that blew up, or our universe detaching from our mother universe, or our ...
- 328
1
vote
2
answers
309
views
Fate of helium moving toward a singularity
On the molecular level, if an atom, consider helium, were to fall into a black hole, what would be the ultimate fate of its electrons, protons and neutrons?
- 19
1
vote
1
answer
498
views
Why does kerr black holes have a ring shaped singularity rather than point?
I read about ring singularity on Wikipedia and didn't quite understand the flow of liquids inside a rotating body causing a ring shaped singularity with zero thickness. Moreover is it specifically ...
- 43
1
vote
1
answer
119
views
If a black hole is spinning, does its singularity have a new name and what is the name? [duplicate]
Think of a spinning black hole. (Kerr black hole)
Every black hole has a point of infinite density, called a singularity.
When a singularity is spinning, does it have a different name?
But when a ...
- 13
1
vote
1
answer
198
views
What happens with the black hole's mass when a black hole disappears?
If a black hole isn't "fed" by attracted matter, it disappears someday. But how is that even possible? What happens with the mass at its singularity? It can't just disappear or am I wrong with ...
- 1,226
1
vote
1
answer
116
views
In the case of heat death of our universe, would proton decay overtake the singularity decay due to Hawking radiation?
According to GUT (The Grand Unified Theory), the half life of protons is 1.67×10^34 years if the standard model is incorrect and the time black holes take to evaporate due to hawking radiation is more ...
- 1,256
1
vote
1
answer
500
views
Why doesn't a singularity spin infinitely fast?
A question for a random reader passing through: because of the nature of things spinning faster when it gets smaller, wouldn't a singularity spin infinitely fast as it's infinitely small, if it has a ...
- 45
1
vote
0
answers
100
views
What happens inside a massive collapsing shell?
I have already asked this on the physics site. I am not sure where it fits better.
Consider a massive spherical shell collapsing under its own gravity. Say the mass is that of one galaxy. The ...
user42560
1
vote
0
answers
125
views
What is the Schwarzschild radius actually?
I am currently writing a detailed essay about black holes, the history of their discovery and their characteristics and I can't find the appropriate literature online and in my local libraries (I even ...
- 11
1
vote
0
answers
53
views
Singularity in Black holes? [duplicate]
What is a singularity (black holes)? What happens to time and space at that point? What does it leads to?
- 11
1
vote
0
answers
67
views
is it possible to prove some version of the "cosmic censorship hypothesis" of Roger Penrose which proposes that this is impossible?
Can singularities not hidden behind an event horizon, known as "naked singularities", arise from realistic initial conditions, or is it possible to prove some version of the "cosmic censorship ...
- 359
0
votes
2
answers
960
views
If space is negative energy and matter is positive energy then does that mean the universe is finite?
I was reading a book by Stephen Hawking, it was written that universe is made up of 2 ingredients,i.e., space and energy and space was the negative energy, so they add up to 0. But since space is ...
- 171
0
votes
1
answer
113
views
If a black hole pulls every object in the universe, why there is a light around it?
I've seen some black hole images and I've seen some movies about it e.g(interstellar). I wonder why it has a light around it. Even if I know that light can't escape through it. Can someone enlighten ...
- 199
0
votes
1
answer
223
views
How does the center of a black hole can contain so much mass? [duplicate]
We know that
"In the center of a black hole is a gravitational singularity, a
one-dimensional point which contains a huge mass in an infinitely
small space, where density and gravity become ...
- 139
0
votes
1
answer
134
views
Does our current understanding of the mass of black hole only allow for it to be located at the singularity? [duplicate]
Does the distribution of mass or density of mass inside the event horizon matter for a black hole to exist as we currently theorize? Could the mass inside the event horizon be distributed in any way ...
- 123
0
votes
0
answers
135
views
My question is about the warp of time and space near black holes
I have seen some recent articles indicating that there might not be a singularity at the center of black hole at all1. Have further heard commentary about black holes that spin incredibly fast.
I was ...
0
votes
1
answer
204
views
Can two singularities combine into one? [duplicate]
We know that black holes can collide and merge, but if they each have a singularity at the core, how can the two singularities merge and become one? Wouldn't the mere fact of a second singularity in ...
0
votes
0
answers
64
views
Was universe spawn from nothing? [duplicate]
Was universe spawn from nothing?
Until now, scientists figured out that the Big Bang happened from a tiny particle which was infinitely energy densed and having infinite mass. If that is the case ...
- 1,007
0
votes
1
answer
243
views
Does a black hole necessarily contain a singularity?
I'm basing this hypothesis on the theories around how an outside observer watching something fall into a black hole will never actually see the thing pass the event horizon. And secondly that from the ...
- 103
-1
votes
1
answer
181
views
Does general relativity imply that singularities cannot exist?
General relativity states that all matter in the universe is moving forward through spacetime at the speed of light. Objects that are stationary in space travel at c along the time axis, and objects ...
- 1
-2
votes
3
answers
254
views
Can black holes even exist [if mass cannot be retained near the collapse threshold]?
A black hole happens because enough material mass exists in an area to create a gravitational field strong enough that nothing escapes (including light). This gravity also exceeds the strength of ...
- 113
-2
votes
2
answers
151
views
Does black hole singularity really exists with respective to relative frame of reference? [duplicate]
How can one describe this phenomena?
What are the factors that we should consider for solving such a problem?
-3
votes
1
answer
285
views
Is our universe a singularity?
According to the Big Bang theory our universe used to be a lot smaller in size.
It actually used to be so small that in the beginning it used to be a singularity.
And the universe started to expand ...
- 1
-3
votes
1
answer
178
views
Why Did The Universe Expand? [duplicate]
If all of the mass and energy in the universe was in a point smaller than the size of an electron at one time, why did it expand? Did it necessarily expand immediately on formation, or could it have ...
- 598