All Questions
5
questions
2
votes
2
answers
129
views
Is entropy dependent on mass alone?
The entropy of a non-rotating, non-charged black hole is only proportional to the surface area of its event horizon (Bekenstein, 1973).
The area of the event horizon of a spherical black hole is only ...
- 117
0
votes
1
answer
116
views
Why is the temperature of a black hole inversely related to its mass?
From what I've read
The temperature of a black hole is measured by the amount of Hawking Radiation emitted.
For a photon to escape, it must travel perfectly perpendicular to the event horizon.
The ...
- 339
1
vote
1
answer
291
views
Mass in general relativity (for black hole)
Based on my knowledge, we have several formalism to calculate the mass of black hole such as Brown-York formalism, ADM method, Hawking mass, Komar,...
What is the difference between them and how ...
- 35
2
votes
1
answer
782
views
Can a High Enough Temperature Create a Black Hole?
My very basic understanding of GR leads me to think that if a substance has a high enough temperature, it can transform into a black hole without a mass required to create a black hole.
The equation ...
- 65
4
votes
0
answers
176
views
A problem with ADM mass in the derivation of 1st law of black hole thermodynamics
The definition of ADM mass is
$$M=\frac{1}{16\pi}\lim_{r\rightarrow\infty}\int \left(\frac{\partial h_{\mu\nu}}{\partial x^\mu}-\frac{\partial h_{\mu\mu}}{\partial x^\nu} \right)N^\nu dA$$
according ...
- 1,487