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12-First 3 minutes (Timeline of elemental abundances (<1s roughly equal…
12-First 3 minutes
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Before p and n
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where'd they come from
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suppose there aren't, and there was a light preference for quarks over anti-quarks
where'd they go
annihilated to form protons, 1.6 billion of them
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lack of anti-particles is consistent with a slight asymmetry within first few microseconds of universe
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He-4 is very stable, so is very resistant to reactions with protons or neutrons
HE-4 can fuse with heavier elements, but these reactions occur much less frequently, so nuclei heavier than He-4 are much less abundant