[BlarfMcFlarf]

Not a physicist, but here is my understanding of the cosmology physics:

High energy can spontaneously form matter antimatter pairs. In the early universe, the heat of the universe was very high, so this was common, constantly happening.

The problem as always if fine tuning. If the early universe was 60-40, that would be understandable. If the early universe was precisely 50-50, that’s fine too. But the universe was 50.0001-49.9999 or something like that, and then all annihilated. It’s too big a difference to easily be random chance, and too small a difference to be easily explained by a starting condition what wasn’t precisely tuned by some mechanism.

[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.