If antimater particles were time reversed then I could see how they could have negative energy and thus antigravity. That's not at all how any observed particles behave though.
Physicists are able to produce small quantities of matter and antimatter, which then annihilate each other, releasing energy. It was a big deal when they were able to trap the antimatter so that it didn't do this.
If the two particles travelled different directions in time, how would they meet?
It’s important to note the distinction between being able to model antiparticles as the time-reverses versions of their partners, and then actually “moving backwards through time” as it were. It’s not as though a sample of anti-hydrogen experiences a reverse or cause and effect.
Also, Tenet was quite good. Antiparticles being time-reversed particles, jinn particles... with humans.
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