Comments on CPT

摘要

I comment on recent experimental results in neutrino physics that are often invoked in the context of the violation of CPT. Even if the hint on the difference of oscillation parameters for neutrinos and antineutrinos is correct, the interpretation in terms of CPT violation is premature, as other CPT-invariant physics may often mimic the same outcome. I also comment on where in nature CPT violation may have played its role, and review the ideas related to the spontaneous generation of the baryon asymmetry of the Universe. I argue that the most promising way of generating baryon asymmetry using CPT violation is the equilibrium leptogenesis, tilted towards particles by effective dimension 5 CPT-odd operators.