All Questions
Tagged with quantum-field-theory black-holes
65
questions
2
votes
0
answers
30
views
Quantum field expansion and bogoliubov coefficients in the interior of a rotating black hole
I am trying to quantize a real scalar field in the interior of a rotating black hole (3+1 D, asymptotically flat). My question is regarding the modes of the radial part of the equation (obtained after ...
- 107
0
votes
1
answer
102
views
Trapping Hawking radiation in black holes?
I was reading this writing (https://davidwoolsey.com/AttO/AttO_blog/Entries/2020/7/13_Black_Holes_and_Transverse_Tidal_Effects%2C_a_revised_essay_on_some_thoughts.html) about considering tidal effects ...
- 2,462
-1
votes
1
answer
52
views
Does matter in the outside universe affect Hawking radiation? [closed]
Is there a way to modify the event horizon to make it generate other particles by affecting quantum fields outside with a giant charge increasing quantum foam disruptions affecting the radiation? Is ...
- 1,534
0
votes
2
answers
162
views
Can a black hole absorb vacuum energy?
Can a macroscopic black hole absorb vacuum energy from the surroundings, and thereby increase its mass?
- 15
2
votes
0
answers
92
views
Are virtual micro black holes being considered in feynman diagrams? [closed]
I wonder if above some energies (or diagram level?) the virtual particles would rather behave (or become) like a micro black hole. Does that make sense? Could this somehow introduce a cut off above ...
- 795
4
votes
0
answers
123
views
Correlators on the Euclidean section of a black hole
In the standard construction of the Euclidean section of a Schwarzschild black hole, we start with the exterior metric in Schwarzschild coordinates:
$$\tag{1} ds^2 = -(1-r_s/r)dt^2 + (1-r_s/r)^{-1}dr^...
- 1,455
4
votes
1
answer
281
views
Is there an explanation for why Hawking radiation causes a black hole to shrink *without* referring to particle/anti-particle pairs?
An observer far from a black hole sees thermal radiation at the Hawking temperature. As a consequence, we are told that the black hole loses energy over time: that is, it evaporates. This logical step ...
- 1,455
4
votes
1
answer
78
views
Why is high energy required if we want to send a message in a short amount of time?
I am somewhat puzzled by the following statement
"If Alice, after crossing the horizon, has less than a Planck time to communicate with Bob about
the status of her qubits, then she is required to ...
- 43
20
votes
3
answers
7k
views
If electrons were just positrons moving backwards in time, then shouldn't we see them coming out of black holes?
I have read this question (What would happen if I crossed the shell of a hollow black hole?):
In effect, the formerly spacelike direction inwards becomes timelike, and the singularity is in the ...
- 29k
0
votes
1
answer
114
views
Dimension of mass of black hole in natural unit
I am reading articles on superradiance, specifically, massive scalr field in Kerr geometry. https://journals.aps.org/prd/abstract/10.1103/PhysRevD.22.2323
One assumption of the article is $$\mu M\ll1,$...
- 442
4
votes
0
answers
301
views
Klein–Gordon Inner Product in Reissner–Nördstrom Spacetime
We consider a massless charged scalar field $\Phi$ on the Reissner–Nördstrom black hole space:
$$ds^2=-f(r)dt^2+f(r)^{-1}dr^2+r^2d\theta^2+r^2\sin^2\theta\,d\varphi^2, \tag{1}$$
with $f(r)=1-\frac{2M}{...
- 257
1
vote
0
answers
59
views
Which ideas from String Theory are useful in other fields? [closed]
I hear sometimes that ideas in String Theory (ST) turned useful in other fields. I am curious, what are these ideas, and what insights or tools did they provide (that otherwise would not be discovered ...
- 2,625
6
votes
1
answer
247
views
Matrix Integrals, Riemann Surfaces & Black Holes. A question regarding one of J.M. Maldacena's talks
I was watching this presentation of Juan Martin Maldacena at Princeton: https://www.youtube.com/watch?v=OMb_P5qPpMc&ab_channel=GraduatePhysics. In one slide he shows an interesting integral. (I ...
user242231
2
votes
2
answers
500
views
Does AdS/CFT correspondence take place only near black holes?
Is it related to black holes or is AdS/CFT a separate thing itself?
user289030
5
votes
3
answers
717
views
Are there fields (of any kind) inside a black hole?
It is said that nothing escapes from black holes, not even light. All particles are now thought to be excitation of different fields (electric field, electromagnetic field, photon field, etc).
Does it ...
- 137