Constraining Antimatter Domains in the Early Universe with Big Bang Nucleosynthesis

Details Constraining Antimatter Domains in the Early Universe with Big Bang Nucleosynthesis Constraining Antimatter Domains in the Early Universe with Big Bang Nucleosynthesis

1999-12-22

arxiv.org/abs/astro-ph/9912473v3

Phys.Rev.Lett. 84 (2000) 3756-3759

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures, revtex, (slightly shortened)

Scientific paper

10.1103/PhysRevLett.84.3756

We consider the effect of a small-scale matter-antimatter domain structure on big bang nucleosynthesis and place upper limits on the amount of antimatter in the early universe. For small domains, which annihilate before nucleosynthesis, this limit comes from underproduction of He-4. For larger domains, the limit comes from He-3 overproduction. Most of the He-3 from antiproton-helium annihilation is annihilated also. The main source of He-3 is photodisintegration of He-4 by the electromagnetic cascades initiated by the annihilation.

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