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

General relativity

  1. Feb 13, 2010 #1
    is it possible to get accurate results of general theory of relativity without retaining the concept of four dimensional curved space
  2. jcsd
  3. Feb 13, 2010 #2
    GR makes use of Riemannian spacetime and without it, no one is able to obtain Einstein field equations!

  4. Feb 13, 2010 #3


    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    "Black holes and time warps: Einstein's outrageous legacy" mentions a version of GR that's equivalent to standard GR (in the sense that it makes the same predictions about experiments), but describes spacetime as flat. In this theory, matter doesn't curve spacetime, it deforms measuring devices.

    I also think that one of the early attempts at a quantum (field) theory of gravity could accurately reproduce the predictions of GR. (Split the metric into a flat part plus the deviation from flatness, g=η+h, quantize only h, and throw away all Feynman diagrams that contain loops).
  5. Feb 13, 2010 #4


    User Avatar
    Gold Member

    'Field Theory Gravity' models gravity as a tensor field in Minkowski space. There's a good discussion by Y. Baryshev in arXiv:gr-qc/9912003 v1 (1 Dec 1999). It is generally believed that FTG is identical to GR but Baryshev disputes this and claims they make different predictions in the high-energy regime.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook