https://www.reddit.com/r/askscience/comments/adjx6u/would_the_physical_properties_of_an_antimatter/
created by iunoionnis on 07/01/2019 at 17:28 UTC
1 upvotes, 1 top-level comments (showing 1)
I was reading about Baryon Asymmetry recently, and was wondering if a universe where the asymmetry were reversed would have any significant differences from our own. Since matter and antimatter are distinguished based on charges (and these, presumably, based on spatial orientation), I would think that a universe with the opposite asymmetry wouldn't have detectable differences within this universe itself (unless we were to somehow contrast the antimatter universe with our own), but it was suggested to me that this might not be the case. (I read something that suggested that the spin of certain atoms is slightly different based on right or left-handedness?)
Comment by mfb- at 08/01/2019 at 04:10 UTC
1 upvotes, 0 direct replies
In our current universe: No. We wouldn't even notice the different charge because the labels "positive" and "negative" are arbitrary anyway.
There are differences between matter and antimatter that we can measure (CP violation), but they only appear at high energies or with very precise measurements - in colliders or in the very early universe.