All Questions
Tagged with black-holes binary-stars
34
questions
8
votes
2
answers
959
views
In which direction would gravitational waves be emitted when two black holes colide?
Imagine two black holes on the x-axis coming together at the origin (not rotating around each other, just falling towards each other).
In which direction would the most intense gravitational waves be ...
user84158
1
vote
1
answer
94
views
Are there any black hole neutron star binary?
Has a black hole-neutron star binary aver been observed?
I mean observed in any way: gravitationally, through eclipse, or any other means.
EDIT Thanks to the comment to this question, we know that ...
- 1,335
4
votes
3
answers
262
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What happens to the accretion disk when two black holes merge?
I'm aware that accretion disks around black holes are formed from the swirling mass of matter that is slowly being stripped of its atoms, but what happens to it when two black holes merge? I was ...
- 87
1
vote
1
answer
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Event-Horizon Shape in a Binary System
I understand that a solitary black hole has a spherical event horizon.
I was wondering whether this still stands in a binary system of two (let's say equal mass) black holes? Could the proximity of ...
7
votes
1
answer
283
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Theoretical solution to binary black hole merger based on Hawking and Ellis
Following Hawking and Ellis, Chapter 9, Fig. 60, Pg. 322, the following figure is meant to illustrate the contrast between apparent horizons and event horizons in the case of a binary black hole ...
- 245
9
votes
3
answers
2k
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How do inspiraling black holes get closer?
In Newtonian mechanics, binaries are stable. We here on earth are very glad that it will not emit its angular momentum and spiral into the sun. What is different about the black holes and neutron ...
- 745
2
votes
2
answers
216
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Time dilation, and curvature of space caused by two black holes of unequal masses
If you were to try to find the time dilation in a region of space near a black hole you would use the equation
$$t_r=\sqrt{1-\frac{2GM}{rc^2}}$$
Would the time dilation from two black holes be this?
...
- 780
1
vote
0
answers
71
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Magnetar's magnetic field near a black hole (novice question)
Even light cannot escape the event horizon of a black hole. Now, imagine a magnetar orbits a black hole. The magnetar orbits too far to be ripped and consumed by the black-hole. However, its magnetic ...
- 409
3
votes
1
answer
286
views
Penrose diagram for two black holes?
Is there a Penrose diagram for two black holes near each other. Perhaps they are colliding or circling each other? Or can this method only describe a single black hole.
user84158
2
votes
1
answer
553
views
What happens to the singularities of two black holes in the moment they merger?
Let's assume the merger of a binary black hole and consider especially the moment of the transition from the last stable orbit to the merger, i.e. the transition where two black holes form one black ...
- 1,589
0
votes
1
answer
300
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Binary System in General Relativity: Analytical Metric? [duplicate]
My question is quite simple, why an analytical metric can't be found for a static binary system, even for a system under the Schwarschild condition : low field, in the vacuum between the bodies so $T_{...
- 11
2
votes
2
answers
339
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Spacetime geometry with a system of $n$ interacting black holes [closed]
The Schwarzschild metric is given by $ds^2=-\left(1-\frac{2GM}{rc^2}c^2\right)dt^2+\left(1-\frac{2GM}{rc^2}c^2\right)^{-1}dr^2+r^2d\Omega^2,$ for $d\Omega^2$ the round metric on the $2$-sphere, in ...
- 153
0
votes
0
answers
1k
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Quadrupole moment tensor
I am currently working on gravitational waves, and as in every lecture on general relativity I derived the symmetric trace-free perturbation of a Minkowski metric with the Lorenz gauge condition, ...
- 566
6
votes
2
answers
1k
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What happens to the angular momentum of two merging black holes?
Suppose that two black holes of roughly equal mass in a binary system, formed from say a large mass stellar binary system, are in orbits around their center of mass. Further, suppose that we are ...
- 545
0
votes
2
answers
247
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Can a binary star system create a stationary black hole?
Research over the last 200 years suggests that half or more of visible stars are part of multiple star systems.
I apologise for the number of assumptions in my question but, because of the numbers of ...
user108787