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This lecture claims that we can generalize QFT to include gravity by adding a metric-based factor to the integral. This sounds awfully easy. What is actually missing from the approach?

Shinjikun
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  • As pointed out here there is no real problem, except that you have to do real QFT instead of the simplified textbook version of QFT. – Count Iblis Oct 30 '16 at 05:03
  • I believe that effective gravitational quantum field theories are ok if higher order terms can be ignored in the expansion,. https://en.wikipedia.org/wiki/Effective_field_theory#Effective_Field_Theories_in_Gravity and see section 1.2 here http://cds.cern.ch/record/686730/files/0311082.pdf – anna v Oct 30 '16 at 06:46
  • Minor comment to the post (v1): Please consider to mention explicitly author, title, etc. of link, so it is possible to reconstruct link in case of link rot. – Qmechanic Oct 30 '16 at 09:20
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    Essentially a duplicate of http://physics.stackexchange.com/q/387/2451 and links therein. – Qmechanic Oct 30 '16 at 09:21

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