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Big Bang Photosynthesis and Pregalactic Nucleon Synthesis of Light Elements

1985
24 pages
Published in:
  • Astrophys.J.Lett. 293 (1985) L53-L57
DOI:
Report number:
  • FERMILAB-PUB-84-121-A
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Abstract: (ADS)
Two nonstandard scenarios for pregalactic synthesis of the light elements (2H, 3He, 4He, and 7Li) are developed. Big bang photosynthesis occurs if energetic photons, produced by the decay of massive neutrinos or gravitinos, partially photodisintegrate 4He (formed in the standard hot big bang) to produce 2H and 3He. In this case, primordial nucleosynthesis no longer constrains the baryon density of the universe, or the number of neutrino species. Alternatively, one may dispense partially or completely with the hot big bang and produce the light elements by bombardment of primordial gas, provided that 4He is synthesized by a later generation of massive stars.
  • COSMOLOGICAL MODEL
  • FUSION
  • LIGHT NUCLEUS: PRODUCTION
  • PRODUCTION: LIGHT NUCLEUS
  • HYDROGEN
  • HELIUM: NUCLIDE
  • LITHIUM
  • HELIUM: PHOTOFISSION
  • BARYON: DENSITY
  • NEUTRINO: MASS
  • 19
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