CPT symmetry

The continuous version of time reversal symmetry is the time translation symmetry that is tied to energy conservation, as was mentioned earlier.

When time is combined with charge and parity, this is a symmetry known as CPT.

This symmetry is considered a cornerstone of the standard model.

No violations of CPT have been observed.

It is a symmetry of any interaction.

Experiments have demonstrated that if CP is violated, T is violated in a way that it cancels out and CPT is not violated.

It is believed to be impossible to construct a quantum field theory that violates CPT.

However, there are ongoing tests that are attempting to observe violation of CPT.