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What does it mean for QFT to be unitary?

I understand the statement that 'X QFT is unitary' is shorthand for saying 'the S-matrix of X QFT is unitary', cf. e.g. this Phys.SE post. Is there some definition of unitarity that is stronger than ...

Jojo

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asked Sep 29, 2021 at 19:55

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What does it mean for QFT to be unitary?

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