Big bang photosynthesis and pregalactic nucleosynthesis of light elements
Two nonstandard scenarios for pregalactic synthesis of the light elements (/sup 2/H, /sup 3/He, /sup 4/He, and /sup 7/Li) are developed. Big bang photosynthesis occurs if energetic photons, produced by the decay of massive neutrinos or gravitinos, partially photodisintegrate /sup 4/He (formed in the standard hot big bang) to produce /sup 2/H and /sup 3/He. 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 /sup 4/He is synthesized by a later generation of massive stars.
- Research Organization:
- Institut d'Astrophysique, Paris; and Laboratoire Rene Bernas, Orsay, France
- OSTI ID:
- 5481934
- Journal Information:
- Astrophys. J., Lett. Ed.; (United States), Journal Name: Astrophys. J., Lett. Ed.; (United States) Vol. 293:2; ISSN AJLEA
- Country of Publication:
- United States
- Language:
- English
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71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ALKALI METAL ISOTOPES
BARYONS
COSMOLOGICAL MODELS
COSMOLOGY
DEUTERIUM
ELEMENTARY PARTICLES
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
FERMIONS
HADRONS
HELIUM 3
HELIUM 4
HELIUM ISOTOPES
HYDROGEN ISOTOPES
ISOTOPES
LIGHT NUCLEI
LITHIUM 7
LITHIUM ISOTOPES
MASS
MATHEMATICAL MODELS
NUCLEI
NUCLEOSYNTHESIS
ODD-EVEN NUCLEI
ODD-ODD NUCLEI
STABLE ISOTOPES
SYNTHESIS