> Could that arise from any early parity symmetry breaking of the weak force?
This is the first thing I wondered! I'm not a physicist and don't know how to answer the question usefully, but if you ever find out, please reply to the thread and let me know. I'll do the same. :)
If anyone is interested in parity symmetry or CPT symmetry in general, I can't recommend this book enough: https://en.wikipedia.org/wiki/The_Ambidextrous_Universe and in particular the part about the Ozma Problem: https://en.wikipedia.org/wiki/The_Ambidextrous_Universe#The_...
Fascinating stuff.