CPT symmetry
Invariance under simultaneous charge conjugation, parity transformation and time reversal / From Wikipedia, the free encyclopedia
"CPT theorem" redirects here. For the album by Greydon Square, see The C.P.T. Theorem.
Charge, parity, and time reversal symmetry is a fundamental symmetry of physical laws under the simultaneous transformations of charge conjugation (C), parity transformation (P), and time reversal (T). CPT is the only combination of C, P, and T that is observed to be an exact symmetry of nature at the fundamental level.[1][2] The CPT theorem says that CPT symmetry holds for all physical phenomena, or more precisely, that any Lorentz invariant local quantum field theory with a Hermitian Hamiltonian must have CPT symmetry.