Does it make sense to say that the processes represented by Feynman diagrams and path integrals (like beta decay) are “real?” If you want to say in what sense they are or are not real, please respond!
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Replying to @litgenstein
Only asymptotic states (ie on-shell) are “real” ..
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Replying to @LambdaQG @litgenstein
By definition vacua are constructed to be Lorentz invariant.. I know QFT on curved spacetime a exist and are just fine , but its writing the curvature source terms that’s the hard part
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Replying to @LambdaQG @litgenstein
No .. I’m just talking about the fact writing down a QFT for GR is hard
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Prob shouldn’t have put the two in a single tweet
11:12 PM - 20 Nov 2019
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