CPT symmetry

Type: Concept

As of November 2026, CPT symmetry has been mentioned in one podcast episode on CERN (Aug 2025). Used to explore varying scales and dimensions of time, connecting quantum physics with cultural perceptions of time.

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. 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 mus