Accomodating relativity to dark matter

3,073
3
If weakly acting dark matter does not interact with photons, how is special (or general) relativity applied in its case? Signaling (or lightlike geodesics) would be hard to define where there is no electromagnetic objectivity. I guess this inertness may be a problem in determining a neutrino's mass and velocity.
 

Garth

Science Advisor
Gold Member
3,572
105
Dark Matter is detected by its gravitational interaction. The curvature of space-time caused by the presence of DM is detected by galaxy rotation curves, the dynamics of galaxy clusters and the lensing of distant quasars. Photons continue to travel on null-geodesics, those null-geodesics are perturbed by the said curvature of space-time, and the deflection of these null-geodesics is a measure of the presence of both seen and unseen mass, the DM is the unseen component.

Garth
 
Last edited:
3,073
3
Thanks, Garth!
 

ohwilleke

Gold Member
1,466
373
Well said Garth.
 

Related Threads for: Accomodating relativity to dark matter

Replies
2
Views
2K
  • Posted
Replies
11
Views
3K
  • Posted
Replies
6
Views
850
Replies
4
Views
646
  • Posted
Replies
9
Views
2K
  • Posted
Replies
2
Views
2K
Replies
7
Views
488

Physics Forums Values

We Value Quality
• Topics based on mainstream science
• Proper English grammar and spelling
We Value Civility
• Positive and compassionate attitudes
• Patience while debating
We Value Productivity
• Disciplined to remain on-topic
• Recognition of own weaknesses
• Solo and co-op problem solving
Top