In QFT, which have infinite degree of freedom, there exlst infinite unitary nonequvilent representation. Expecially after phase transition, the two representation are unitary nonequvilent. So can we say that unitary are broken in QFT? Or a pure state can evolved to a mixed state which is a puzzle in black hole physics?(adsbygoogle = window.adsbygoogle || []).push({});

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# Unitary in quantum field theory

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