Antimatter and Time

[Zarnaxus]

I have heard once that antimatter is similar to regular matter, execpt it has the opposite charge AND it is travelling backward in time.

 

I am not exactly sure the source from which i got this information, but i would like it to be clarified. How does it work? How did someone discover this? and why does it make sense?

[swansont]

Antimatter is indistinguishable from matter traveling backward in time, owing to the symmetries involved (charge, parity and time-reversal). That's not quite the same as saying it is matter traveling backward in time.

[Zarnaxus]

so how did someone reach this conclusion and how does it make sense (why is it indistinguishable from matter traveling backward in time)?

[swansont]

As I said, it's due to the symmetries. The concept is part of Feynman diagrams.