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Results tagged with dark-matter
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user 34155
Questions about the source or effects of the matter that makes up 85% of the matter in the universe but appears to only interact gravitationally.
21
votes
1
answer
3k
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Why doesn't dark matter clump strongly in the center of galaxies, since it doesn't feel eith...
Dark matter is described as being spread not only throughout a galaxy, but also around it in a halo of some sort that extends far beyond the visible parts of the galaxy...
In fact, dark matter haloes …
- 5,585
2
votes
In 'Modified gravity' theories like MOND, are galaxies and stars actually, slowly accelerati...
As @PeterErwin's comment compassionately points out:
"Acceleration" means changing the velocity vector, so an object in a circular orbit is always "accelerating" (because the direction of the velocit …
- 5,585
2
votes
2
answers
161
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 E …
- 5,585
2
votes
1
answer
89
views
In 'Modified gravity' theories like MOND, are galaxies and stars actually, slowly accelerati...
In the Modified Theory of Newtonian Gravity or MOND, they say that massive objects, accelerating slowly, experience this modified gravity.
But are they actually gaining in velocity, albeit very slowly …
- 5,585
1
vote
0
answers
108
views
Why do most astrophysicists believe the cosmic microwave background (CMB) provides the best ...
I frequently read that the cosmic microwave background contains the best overall evidence for the existence of dark matter, and conversely against alternative gravity theories like MOND.
However, I ca …
- 5,585
1
vote
1
answer
108
views
Why are WIMP dark matter particles, if Majorana-like, expected to annihilate upon contact? B...
I have heard a lot recently about so-called 'dark stars'; stars that are formed with the help of the gravitational pull of dark matter, or perhaps entirely from self-annihilating Majorana-type dark pa …
- 5,585
1
vote
2
answers
390
views
What is a 'square' Kelvin degree? μ$K^2$? In terms of the cosmic microwave background's (CMB...
From what I have read and seen, the minute temperature fluctuations in the CMB are measured in microKelvin, or μK.
However, many charts and graphs show μK2, or 'microKelvin-squared'.
Do they simply me …
- 5,585