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

Have any test confirmed LQG?

  1. May 12, 2008 #1
    I heard there were currently some tests trying to prove LQG.
    One had to do with the radiation from distant cosmic explosions called gamma-ray bursts they might provide a way to test whether the theory of loop quantum gravity is correct or not.
    Does anyone know any up to date info about these tests, and about how LQG is doing with them?
     
  2. jcsd
  3. May 12, 2008 #2

    turbo

    User Avatar
    Gold Member

    Fotini Markopoulou positied years ago that ultra-high-energy gamma rays should interact more frequently with the space through which they propagate and thus be slowed relative to EM of lower energies. Given the distances involved to GRBs, she believed that GLAST might be able to detect such a delay. GLAST has not yet launched, but the MAGIC consortium has observed a delay in the arrival of such energetic gamma rays in a single GRB observation last summer. They use a Cherenkov air-shower telescope to observe GRBs. It should be noted that the delay could be intrinsic to some as-yet understood mechanics at the source. If GLAST does indeed detect energy-dependent delays, AND if the length of the delays are proportional to the redshift of the emitter, LQG would get a big shot in the arm.
     
  4. May 12, 2008 #3
    Well you can bet that marcus would be the first person to link you to the abstract of the paper.
     
  5. May 12, 2008 #4

    turbo

    User Avatar
    Gold Member

    Oops! As-NOT-yet understood mechanics. If we assume that a GRB sheds EM at all frequencies at the same time, we've got a puzzle here that needs to be probed. If there is a mechanism by which the body responsible for the GRB sheds EM in stages and can release ultra-high frequency EM later than the initial burst, LQG gets no brownie points.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?