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Three capitals together, a symmetry believed exact.
Also known as: CPT symmetry, CPT theorem, Charge parity time
CPT is charge conjugation, parity and time reversal applied together, and the CPT theorem says any reasonable quantum field theory must respect it exactly. Each of the three alone is violated; the combination has never been seen to fail, and a failure would break relativity.
Denotes the combined operation of charge conjugation, parity inversion and time reversal.
Contexts: Laboratory
Is required to be an exact symmetry of any local, Lorentz-invariant quantum field theory, which is the CPT theorem.
Contexts: Laboratory
Has never been observed to be violated, and a violation would imply a breakdown of Lorentz invariance itself.
Contexts: Laboratory
Three capital letters C, P and T set together in roman type.