[raxxorraxor]

Not a physicist either but pair production also occurs in "non extreme" conditions and is still quite common.

If find this question fascinating. Matter can only ever exist with respective anti-matter. Question is where has all the antimatter gone? Are there processes were it does indeed behave different from matter? So where is it? Since a photon and antiphoton are the same and do not absorb each other, we should be able to see it, shouldn't we?

I still want to believe in the antimatter universe where there is some evil twin of mine.