All Questions
56
questions
11
votes
11
answers
4k
views
What would one use a theory of quantum gravity for?
I am generally wondering how useful new more ambitious theories would be considering that even with standard non-relativistic electrostatic QM one usually has to employ unsatisfyingly crude ...
- 1,202
1
vote
0
answers
104
views
Can black holes exchange Hawking radiation, avoiding complete evaporation?
I was wondering if it would be possible that, as a black hole radiates its mass as Hawking radiation, another black hole could absorb that radiation and then when the second black hole radiates its ...
- 2,462
9
votes
4
answers
3k
views
Is it possible to have a stable black hole that does not evaporate?
Black holes would presumably evaporate in the long future via Hawking radiation.
However is this inevitable? Or are there any mechanisms that would compensate the lost mass due to Hawking radiation ...
- 2,462
2
votes
1
answer
183
views
Why can't the answers to equations be infinity?
When talking about black holes and singularities, most books say that combining relativity and quantum mechanics gives the answer of infinity in some equations. They also say that:
Infinity is the ...
- 23
-7
votes
1
answer
334
views
Falsifiability of a hypothesis related to a gravitational geon at the edge of Solar System that I postulate [closed]
This post is a version of a post with identificator Meta PSE 12909 that I've asked in recent past years on Meta Physics Stack Exchange Asking if the following post could be suitable for the main site ...
0
votes
1
answer
196
views
How is a black hole compatible with quantum theory? [duplicate]
A black hole has a radius of $R = \frac {2Gm}{c^2}$, in this context, if we take a single proton and neutron as a black hole, its Schwarzschild radius will be near about $4.8 \times 10^{-52} \mathrm{m}...
- 91
-3
votes
1
answer
282
views
Can we use entangled particles to find out what is going on inside a black hole? [closed]
If you throw one entangled particle inside a black hole can we know what is happening with it from looking into another entangled particle outside the black hole?
How this puzzle is related to ...
- 1
3
votes
1
answer
124
views
Where does the black hole firewall energy come from?
There are a couple threads on the firewall paradox on StackExchange, however I have not been able to find one that explains the physical origin of the firewall in black hole evaporation.
There is an ...
- 153
0
votes
0
answers
23
views
Energy of two particles moving towards each other at near lightspeed relative to each other [duplicate]
I understand that this question might arise from multiple misconceptions and misunderstanding, I'm not from a physics background. If in a vacuum we had two particles A and B moving towards each other ...
- 3
0
votes
0
answers
72
views
What is the minimum density required for an object to become a black hole? [duplicate]
What is the minimum density required for an object to become a black hole?
I ask this because whenever I research about black holes it is always said to have infinite density or infinite mass.
...
- 21
0
votes
3
answers
202
views
Can you see on Miller's planet?
I have read this question:
Miller's world would be fried by a strong flux of extreme ultraviolet (EUV) radiation. The cosmic microwave background (CMB) would be blueshifted by gravitational time ...
- 29k
0
votes
4
answers
241
views
Does an observer experience stronger gravity on the way towards the singularity?
I have read this question:
Clearly as you approach the singularity the tidal force on a body increases.
Are the fundamental forces unified in a black hole?
Based on the questions on this site, ...
- 29k
3
votes
1
answer
447
views
Can Hawking radiation decrease the area of the event horizon or not?
I have read this question:
Null Energy Condition Violation in QFT and Area Theorem
Can black holes shrink in classical general relativity, violating area theorem?
And this one:
When one considers ...
- 29k
10
votes
3
answers
1k
views
Does an accelerating charged black hole emit EM radiation?
I have read this question:
Charged particle is accompanied with EM radiation (has field that falls with distance as 1/r) when it moves with acceleration.
Does a constantly accelerating charged ...
- 29k
1
vote
1
answer
361
views
How do particles in merging black holes "know" they need to change direction in time towards a new singularity?
I have read this question:
Therefore there is nothing (except things travelling towards the singularity) inside the event horizon of a black hole.
Does anything exist between singularity and the ...
- 29k