The possibility of observed direct CP violation could have broad implications with regard to the CPT Theorem and the universe. As was previously stated, in order for the CPT Theorem to hold, a violation in one of the parameters must accompanied by a compensating violation of another parameter. If CP is violated, the time parameter must also be violated so that CPT may be conserved. Theorists have found very strong proofs of the validity of the CPT Theorem, and experimentalists have also discovered a wealth of information which supports the theorem. Therefore, if the direct CP violation is observed the time reversal nonconservation is implied.
Physicist believe that time reversal is independently symmetric.
One problem is that all particles are eigenstates of parity, and some are eigenstates of charge conjugation, but no particles are eigenstates of time reversal. Therefore, experiments which independently test the symmetry of time reversal are difficult because they are susceptible to errors and because any asymmetry would be very small. The discovery of direct CP asymmetry would provide physicists with greater insight of the nature of the universe. If the symmetry between matter and antimatter were perfect, the universe would be composed equally of matter and antimatter, which would interact and annihilate each other, releasing energy. Observation reveals that the universe is composed almost exclusively of matter, with a very small antimatter composition.