All Questions
78
questions
6
votes
1
answer
89
views
Extreme Mass Ratio Inspirals and GWs cycles
I was reading through the following paper GRMHD study of accreting massive black hole binaries in astrophysical environment: A review. Therein, we have the following image
It is not quite clear how ...
- 1,213
0
votes
0
answers
48
views
What is the difference between Hawking radiation and a black hole laser?
While reading this paper (https://arxiv.org/abs/1409.6550), I got a little bit puzzled: what is the difference between Hawking radiation and a black hole laser? Is it the same thing? From my ...
- 159
1
vote
1
answer
156
views
Can a single black hole emit gravitational waves and evaporate?
I have read this:
Yes, single neutron stars can emit gravitational waves if they have sufficient asymmetries.
For some background, an object symmetric about its axis of rotation does not produce ...
- 29k
0
votes
1
answer
65
views
Gravitational recoil with stars/planets...? [closed]
When two black holes are merging, one of them can be ejected if it has less mass than the other black hole, so the gravitational waves emitted by both of them is unbalanced, and the more strong ones ...
- 2,462
0
votes
0
answers
53
views
How does according to modern physics collision between two massive black holes create new space or new spacetime?
Now (hypothesis) -- And the Physics of Time
In this page the author talks about (find in page) (in the context of LIGO Observatories-->) "In their most powerful event, reported just this past ...
1
vote
1
answer
71
views
Mass redshift degeneracy for binary black holes at all order in post-Newtonian perturbation theory
When you compute the inspiral signals of a binary black hole to lowest order in the post-Newtonian formalism, and study how this solution propagates through an expanding spacetime, you find that the ...
- 758
-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 ...
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
0
answers
74
views
If a black hole doesn't have all its mass at a singularity and the mass is not uniformly distributed and rotating, would it emit gravitational waves?
Would a black hole with a rotating quadrupole moment in its mass distribution generate gravitational waves?
user355436
3
votes
0
answers
59
views
Can gravitational waves have event horizons?
Is there a spacetime that contains traveling planar event horizons?
- 519
1
vote
1
answer
46
views
Closest possible orbital radius for equal masses
If you have two objects of equal mass, then what’s the closest distance that they can orbit at in terms of their schwarzschild radii? How fast would they be orbiting?
What About stable orbits?
- 2,908
0
votes
1
answer
159
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In pure GR can a black hole spontaneously appear?
In a universe without matter and just gravitation fields, can a black hole spontaneously appear? I would assume it could since such a black hole would evaporate purely into high energy gravitons. The ...
user84158
4
votes
1
answer
316
views
Smooth vs analytic spacetimes
Recently in more technical settings (I was learning algebraic QFT), I encountered the term "real analytic" manifolds (Lorentzian manifolds, to be precise). This is in contrast to smooth ...
27
votes
1
answer
4k
views
Where does the kinetic energy of the orbiting black holes go after the merger?
The first gravitational wave ever observed, GW150914, was calculated to be caused by a merger of two black holes of 36 and 29 solar masses. The resulting black hole had a mass of 62 solar masses, and ...
- 371
6
votes
1
answer
305
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Does the ringdown phase of a black hole merger ever stop?
When binary black holes merge they emit gravitational waves in three stages, the inspiral in which the two black holes shed angular momentum through gravitational waves at a rate that becomes ...
