Today I was thinking, Since Positron has a negative energy according to Dirac and it can be interpreted as an Electron going back in time, what would happen to the entropy of a system made out of antimatter? Is it decrease over relative time ? Is a world made of antimatter is just the past relative to present of a world of matter? After all Positron is just an Electron with the opposite energy and same spin. An Electron move back and forth in time changing into Positron and back.

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