All Questions
Tagged with black-holes thermodynamics
306
questions
2
votes
0
answers
85
views
BTZ partition function
I am unable to obtain the internal energy of the BTZ black hole. Recall its metric, which is given by
\begin{align}
ds^2=-N^2(r)dt^2+\frac{dr^2}{N^2(r)}+r^2\left(d\phi+N^\phi(r)dt\right)^2\,,
\end{...
- 378
1
vote
0
answers
38
views
What is the physical meaning of critical points in black hole thermodynamic topics?
In black hole thermodynamic topics, the critical points sometimes calculate. They are introduced in different types and calculated in conventional forms.
Recently, in thermodynamic calculations, these ...
- 65
0
votes
0
answers
62
views
Are black holes black body? [duplicate]
I've read online that black holes are almost ideal black bodies. But for a body to be called an ideal black body it should emit all the rays of all the wavelengths but black holes don't, so how can we ...
- 21
1
vote
1
answer
194
views
How to derive form of reflecting waves from black holes?
Consider a collapsing sphere that becomes a black hole. The interior schwartzchild lightcone coordinate $U$ can be written as $U$ = $\tau - r + R_{0}$ where $R_{0}$ is the radius of the sphere before ...
user310742
0
votes
1
answer
96
views
Does Hawking radiation have a statistical physics origin like the usual derivation of Boltzmann factors?
According to Andrew Steane's Thermodynamics chapter 19 on Thermal radiation:
"The total emission from a physical object can usefully be separated in two parts: the thermal radiation and the rest. ...
- 2,100
1
vote
2
answers
141
views
How are black-hole evaporations possible?
It is believed that if, $$
R \leq \frac {2Gm}{c^2} \; \;\;\;\; (1)
$$ is black hole and due to Hawking radiation it losses mass and subsequently when, $$R \geq \frac {2GM}{c^2} \;\;\;\;\;\; (2)$$ ...
- 91
1
vote
1
answer
161
views
How to move from AdS to dS space?
I studied different black holes in different spacetime and I also checked their differences, for example, the difference that exists in dS and AdS spaces. The question that has been created for me is ...
- 65
4
votes
1
answer
261
views
Why Black Hole is maximally chaotic?
I understand intuitively that black holes are chaotic. However, people say black holes are not just chaotic, they are "maximally chaotic". What is the quantitative definition of "...
- 43
3
votes
1
answer
348
views
What is BPS state?
I am preparing a presentation about black holes thermodynamics in string theory. Both in polchinski and in many famous articles there is a discussion about BPS and I am not able to understand why it ...
- 1,734
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
1
vote
1
answer
133
views
What is the fundamental reason why information is on the event horizon of a black hole?
I don't know the mathematics behind black holes and information theory but is there a simple explanation of why information is on the event horizon. Why can't it be elsewhere?
user355436
2
votes
2
answers
104
views
Does black hole entropy change as a gravitational wave passes it?
The black hole entropy depends on the area of the event horizon.
Do gravitational waves change this area?
Does the entropy increase and then decrease as the horizon stretches and contracts?
user355436
1
vote
1
answer
70
views
Why is a primordial black hole's mass of the same order as the horizon mass in the early universe?
I am reading a paper on primordial black holes (PBHs), and it says that PBHs should form during the first second of the universe with masses of the same order of magnitude as the horizon mass.
I ...
- 555