Tagged Questions
4
votes
2answers
111 views
Can dark matter be relativistic dust?
As far as I know the mass of an observed object increases as it approaches the speed of light.
Is it possible that the excess mass called "dark matter" is due to relativistic dust?
Surely, stars ...
-2
votes
1answer
147 views
Does Dark Matter have more space-time or particle characteristics?
Dark Matter appears to have more in common with phenomena related to spatial geometry then a particle. I thought in General Relativity, space can be curved without the presence of matter so ...
4
votes
1answer
165 views
Does conformal gravity explain the Bullet cluster lensing effects?
Conformal gravity is an "alternative" theory of gravity, where instead of using the Einstein-Hilbert action composed of the Ricci scalar, the square of the conformal Weyl tensor is used. It was ...
2
votes
1answer
126 views
Relativistic Mass and Dark Matter
In a question here Ron Maimon comments that "relativistic mass makes gravity, not rest mass."
If so, does that mean that the faster that stars orbit the galaxy the larger the relativistic mass of the ...
4
votes
1answer
155 views
How much does electromagnetic radiation contribute to dark matter?
EM radiation has a relativistic mass (see for instance,
Does a photon exert a gravitational pull?), and therefore exerts a gravitational pull.
Intuitively it makes sense to include EM radiation ...
1
vote
3answers
181 views
Theory that gets rid of dark matter/energy
Is there any physics theory that either groups together gravity and dark energy/dark matter or eliminates dark energy/dark matter by modifying standard understanding of gravity or any force? If so, ...
8
votes
4answers
325 views
What makes the stars that are farther from the nucleus of the galaxy go faster than those in the middle?
It has no sense that stars that have a bigger radius and apparently less angular speed($\omega$) goes faster than the ones near the center.
4
votes
1answer
106 views
Can dark matter and energy be formulated as local perturbations of the metric
Note, my formal physics education ended over ten years ago so I may be missing some obvious piece of understanding.
The relationship between space-time and matter/energy distribution is described by ...
7
votes
2answers
235 views
Would dark matter absorb gravitational waves?
Would the vast and seemingly diffuse clouds of dark matter floating around our galaxy (and most others) absorb gravitational waves? Is this perhaps why we haven't detected any yet?
7
votes
2answers
492 views
Is dark matter repulsive to dark matter? Why?
I think I saw in a video that if dark matter wasn't repulsive to dark matter, it would have formed dense massive objects or even black holes which we should have detected.
So, could dark matter be ...
