A question I'm too amateur to resolve on my own is what if the Big Bang simply created two universes? One made primarily of "matter" and the other made of "ant

A question I'm too amateur to resolve on my own is what if the Big Bang simply created two universes? One made primarily of "matter" and the other made of "anti-matter?" What if the big bang was simply a Casimir event? The particles should have collided and annihilated, but didn't? The result being two new universes pulled into existence by the sudden inversion of entropy?