You didn't answer the question, nor did you give any grounds for thinking it doesn't need answering.
Occam's razor applies to theories, not to individual propositions about them. CPT (or T) symmetry isn't something you build into a physical theory by having an axiom like "CPT-symmetry holds"; it arises from the structure of the theory. Do you have any actual reason for believing that theories with T-symmetry but not CPT-symmetry are simpler than theories with CPT-symmetry but not T-symmetry? The CPT theorem seems to me to give good reason not to believe that.
Do you have any actual reason for believing that theories with T-symmetry but not CPT-symmetry are simpler than theories with CPT-symmetry but not T-symmetry?
Well, I think so, but maybe not in a format suitable for a short blog post. There are numerous small, simple CA with the property of being symmetrical under T=-T. For example, the BBM. My impression is that other means of reversal are correlated with automaton complexity. Then there's the idea of charge as a pump. That is appealing on other grounds - and pumps tend to have moving parts - which ...
http://lifeboat.com/blog/2011/06/dear-dr-hawking
Hey guys, my quantum physics is not powerful enough to understand this guy... Can anyone help me out with this one?
Thanks LW