There's a theorem that says certain quantum field theories are invariant under CPT, namely charge conjugation (particle→ antiparticle), parity (space inversion, x→-x), and time reversal (t→-t). The "particles traveling back in time" stuff seems to come from the mention of T. https://t.co/qsvO61wmM8
— \mathcal{L} (@litgenstein) May 20, 2020
via Twitter https://twitter.com/litgenstein
May 21, 2020 at 05:27AM
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