Science Buddies: "Ask an Expert"

so if I understand correctly Richard Feynman proved that antimatter is flowing through time in the opposite direction...
i hear about the paradox of where all the antimatter went during the big bang. why do we observe only matter left over? if antimatter flows in the opposite direction in time, wouldn't it be flowing further into our past from the point of origin? wouldnt the two have been separated by their respective directions of time instantly? (time being a direction in spacetime thus the potential future of the 'anti-realm') so wouldn't theoretical physicists be asking the same question 27.4 billion years ago about what they consider 13.7 billion years in their past?

Hello, the best we can say is we can interpret antiparticles as if they are traveling backward in time when we describe them in mathematical models. By no mean we have proven experimentally they are actually going backward in time.