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When does quantum gravity become important?

  1. Mar 13, 2013 #1
    Title^
     
  2. jcsd
  3. Mar 13, 2013 #2

    Vanadium 50

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    Tuesday, I think.

    Can you be a bit more specific?
     
  4. Mar 13, 2013 #3
    I am also curious as to what scales of curvature, length, time, acceleration and other possible factors make quantum effects important in gravity. Sorry for not using covariant quantities.
     
  5. Mar 13, 2013 #4
    Amusing.
    In what kind of a physical situations do our current models (QFT,standard model, GR) fail to predict with accuracy?
     
  6. Mar 13, 2013 #5

    dx

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    At the Plank scale.
     
  7. Mar 13, 2013 #6

    Vanadium 50

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    Thanks - much clearer.

    There is no system in which both GR and QM are necessary to explain observations. So at the moment this is a purely academic exercise.
     
  8. Mar 13, 2013 #7

    dx

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    No currently experimentally accessible situations
     
  9. Mar 13, 2013 #8
    Is that the source of the difficulties? Having no physical results to go by.
    For example SR, GR and QM were all guided by experiments which could not be accounted for at the time with classical theories.
     
  10. Mar 13, 2013 #9

    dx

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    The following quotations may be relevant:


     
  11. Mar 13, 2013 #10

    Bill_K

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    Situations which in classical and semiclassical GR can be represented only as singularities.
    a) The big bang
    b) The endpoint of gravitational collapse
    c) The endpoint of black hole evaporation
    ...
     
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