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Why do matter and antimatter annihilate? (bigthink.com)

submitted 5 months ago by [email protected] to c/[email protected]

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From forming bound states to normal scattering, many possibilities abound for matter-antimatter interactions. So why do they annihilate? There’s a quantum reason we simply can’t avoid.

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[–] [email protected] 3 points 5 months ago

There aren't. Even in "empty" space, there's about one atom per cubic meter, enough for a small amount of annihilation. We haven't detected any regions bordered by gamma ray emissions that would indicate a matter-antimatter boundary.

https://en.wikipedia.org/wiki/Baryon_asymmetry#Regions_of_the_universe_where_antimatter_dominates