Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Accomodating relativity to dark matter

  1. Jul 9, 2005 #1
    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.
  2. jcsd
  3. Jul 10, 2005 #2


    User Avatar
    Science Advisor
    Gold Member

    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.

    Last edited: Jul 10, 2005
  4. Jul 10, 2005 #3
    Thanks, Garth!
  5. Jul 19, 2005 #4


    User Avatar
    Gold Member

    Well said Garth.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Accomodating relativity to dark matter