Puzzling thing about QFT in curved space-time

  1. In the page http://en.wikiped
    ia.org/wiki/Hamilton%E2%80%93Jacobi%E2%80%93Einstein_equation, under Shortcomings of four-dimensional spacetime", you can see the following line:
    Is it correct?

    If it is, how can it be? Because in GR, gravity is space-time curvature!!!
  2. jcsd
  3. ChrisVer

    ChrisVer 2,378
    Gold Member

    You can have how fields interact in a given curved spacetime.
    You cannot solve for that spacetime (in order to let the metric be a dynamical variable).
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