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

Spacetime light

  1. Sep 11, 2007 #1

    wolram

    User Avatar
    Gold Member

    Light that has traveled millions of years is gravitationaly (lensed) around a body,
    if there is any frequency dependant light travel time ,would it not show up as if it
    had been split by a prism when it was lensed around said body, or would the various frequencies recombine?
     
  2. jcsd
  3. Sep 11, 2007 #2
    Basically no, the path-bending of null geodesics in GR is independent of colour (indeed, colour is relative).

    There are other arguments to consider, the most significant being the recent possible observation that high energy photons move at slightly different speeds (think "vacuum" refractive-index).
     
  4. Sep 12, 2007 #3

    wolram

    User Avatar
    Gold Member

    Thanks cf, i do not know what , "vacuum" refractive-index is, i will look it up, i have an idea but could be way out.
     
  5. Sep 12, 2007 #4

    wolram

    User Avatar
    Gold Member

    The only papers i can find with (vacuum refractive index ) are sub only.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Spacetime light
  1. Spacetime gravity (Replies: 4)

  2. Spacetime Diagrams (Replies: 5)

  3. The Shape of Spacetime. (Replies: 142)

  4. Is spacetime flat? (Replies: 13)

Loading...