All Questions
72
questions
3
votes
1
answer
96
views
Different Bekenstein bound equations – what’s the difference?
Can someone help me understand the difference between the Beckenstein bound equations that I’ve come across? They all appear to have different dimensions.
I’ve been told that if you include the ...
- 33
3
votes
0
answers
56
views
Generalized entropy of black holes
In the review paper 2006.06872 by Maldacena, in eq.(2.4) they wrote that the total entropy of a black hole and its environment also has a contribution from the quantum fields outside the horizon which ...
- 404
2
votes
0
answers
47
views
Calculating the Bekenstein-Hawking entropy for 1+1 black hole with dilaton background
According to this paper the Bekenstein-Hawking entropy of a 1+1 black hole which described by the $SL_k(2,\mathbb{R})/U(1)$ WZW cigar geometry is given by the following formula appearing in eq. (5.7):
...
3
votes
0
answers
79
views
Entanglement entropy as the source of Bekenstein-Hawking entropy
I think I'm missing something about interpreting a black hole's entanglement entropy as the source of it's Bekenstein-Hawking entropy, and I can't find any literature on it.
So, we know that our ...
- 31
1
vote
1
answer
232
views
Could any new structures be formed after the heat death of the universe?
When the universe would reach a maximal state of entropy, heat death would presumably be reached and no structures would be left after the last black hole would evaporate.
However, is this really true?...
- 2,462
2
votes
3
answers
409
views
What is a black hole microstate?
What is the most generally accepted way of defining what a black hole microstate is? On a related note, I don't believe there is a Wikipedia page on the topic.
- 246
0
votes
0
answers
74
views
Why black hole erase information
It is usually said that according to the no hair theorem, black holes erase the information enter them which reduce the entropy and imply the so called "information paradox".
The problem is ...
- 1,734
1
vote
0
answers
43
views
How to calculate the total entropy of dS black holes?
In several articles where the thermodynamics of dS black holes have been investigated, the entropy part of the model or the total entropy has been analyzed based on the entropy of the black hole ...
- 65
1
vote
1
answer
45
views
What happens to the entropy of the pre-existing information on a black hole event horizon as more mass falls into the hole?
Does the old entropy stay the same as new bits of information are added to increase the overall entropy?
user355436
2
votes
2
answers
101
views
Will a black hole disappear?
Reading The brief history of time by Stephen Hawking and the chapter 7 BLACK HOLES AIN’T SO BLACK has below.
Does it mean if his theory is correct, a black hall can disappear on its own?
Because ...
- 169
1
vote
2
answers
235
views
What does the no-hair theorem state about the entropy of black holes?
So does the no hair theorem say that all classical black holes will have zero entropy? If yes, why?
- 19
3
votes
1
answer
185
views
Conceptually, why is the entropy of black hole related to Planck length?
I was watching a lecture on the holographic principle, and it presented the equation for the entropy of a black hole as $$S_{BH} = \frac{A}{4l_p^2}$$ My question is why, conceptually, the entropy of a ...
- 1,261
4
votes
1
answer
140
views
Quantum extremal surface and black hole evaporation inquiry
Recently there has been progress made in the black hole information paradox by using the tools of AdS-CFT correspondance. Specifically, the Page curve for an evaporating black hole has been ...
- 153
5
votes
1
answer
630
views
Gravitational path integral derivation of black hole temperature and entropy
Using the gravitational path integral we can define the partition function as:
$$
Z(\beta) = \int\mathcal{D}g\mathcal{D}\phi e^{-I_E[g,\phi]}
$$
with boundary conditions:
$$
t_E \sim t_E + \beta, \...
- 141
4
votes
2
answers
109
views
Do black hole horizons always increase?
In asymptotically flat spacetimes, the area of a black hole event horizon must always increase, provided the Null Convergence Condition is followed ($R_{\mu\nu}k^{\mu}k^{\nu}\geq0$ for all null ...
