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Constraining antimatter domains in the early universe with big bang nucleosynthesis

Physical Review Letters, ISSN: 1079-7114, Vol: 84, Issue: 17, Page: 3756-3759
2000
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  • Citations
    31
    • Citation Indexes
      31

Article Description

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. For larger domains, the limit comes from He overproduction. Since most of the He from ¯pHe annihilation are themselves annihilated, the main source of primordial Heis the photodisintegration of He by the electromagnetic cascades initiated by the annihilation. © 2000 The American Physical Society.

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