All Questions
Tagged with black-hole dark-matter
18
questions
1
vote
0
answers
87
views
Have measurements been conducted on the position of the galactic center of mass and the orbit of the presumed black hole at the center?
Related questions have been raised before
Is our central black hole actually at the CG of the galaxy?
Orbiting supermassive black hole or galactic center of mass?
, where explanations have been given ...
- 301
1
vote
0
answers
78
views
Could both the high incidence of supermassive Black Holes (BH) and the expansion of the universe be consequences of vacuum entanglement energy?
The notion that spacetime may emerge from entanglement between factors comprising a Hilbert space decomposition of the vacuum has been suggested by many (for example, M. Van Raamsdonk “Building up ...
- 33
1
vote
1
answer
176
views
Do black holes emit dark matter as Hawking radiation?
When a star made from protons neutrons and electrons becomes a black hole that black hole can emit protons neutrons and electrons as Hawking radiation.
Dark matter is unusual matter: is there any ...
user50918
10
votes
2
answers
1k
views
Could we detect dark matter by black holes gaining unexplained mass?
Dark matter is said to interact only gravitationally, so it won't commonly form black holes by itself. But if a black hole is already there, and dark matter encounters the event horizon, it should go ...
- 255
1
vote
2
answers
128
views
Could primordial black holes explain the SMBH in the galactic centers?
If there were enough primordial black holes (with the right mass) they could explain dark matter. Could they explain the gargantuan monster holes in the center of galaxies?
- 1
2
votes
2
answers
202
views
At what distance does MOND Modified Newtonian Dynamics take effect?
At what distance does MOND Modified Newtonian Dynamics take effect? I understand MOND is described in relation to very slow accelerations, which is related to distance. It is mentioned it has an ...
- 474
1
vote
1
answer
413
views
Is a black hole found in the centre of the low-surface-brightness and dark-matter-free galaxy AGC 114905
Per information found on Internet:
AGC 114905 was discovered while observing the constellation Pisces with the VLA ground-based radio telescope. The galaxy is about 250 million light-years distant ...
- 701
2
votes
2
answers
153
views
Does the density of a black hole decrease after releasing a large amount of Hawking radiation?
Is is true that the smaller a 'regular', stellar-mass black hole is, the denser it is inside of its event horizon? After all, if you look up (or calculate) the Schwarzschild radii of the Sun and the ...
- 5,177
5
votes
1
answer
702
views
Would the stars look different if many primordial black holes were present?
Suppose that there are many primordial black holes. These are point masses which have a small probability to collide with stars let alone themselves.
They are formed in the early universe and could ...
7
votes
2
answers
311
views
Can dark matter be normal matter after all? [duplicate]
MACHO's and RAMBO's are both baryonic (and leptonic) forms of matter that can't be observed by their nature. They barely emit or reflect light. Black holes, neutron stars, or brown dwarfs (or groups ...
0
votes
0
answers
85
views
How do dark stars form?
I'm not referring to a star made of dark matter or a Newtonian dark star. I'm talking about a star powered by dark matter annihilation. I imagine it would form close to the centers of galaxies where ...
- 41
10
votes
1
answer
660
views
Are black holes considered part of baryonic content of universe?
Are black holes (like those detected by LIGO, for instance) part of baryonic content of universe or part of dark matter? Why?
- 1,074
2
votes
2
answers
349
views
The consequences and the mechanisms of a shift of the Earth away from the sun
First premise: I have already made this question in the worldbuilding section, but since it is a very specific question many have recommended me to write in the astronomy section so here we are.
...
- 31
13
votes
2
answers
402
views
Are black holes expected to contain the same ratio of dark matter to regular matter as the rest of the universe?
Are black holes expected to contain the same ratio of dark matter to regular matter as the rest of the universe? I've heard that dark matter is distributed in halos around galaxies. Does that make it ...
- 1,566
5
votes
1
answer
278
views
Could undiscovered smaller black holes within galaxies be an explanation for dark matter?
From what I've read, given the speed of stars rotating within a galaxy and the known mass, the stars' speed is too fast to stay in orbit. Dark matter was proposed to explain this but is it possible ...
- 153