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Effect of interacting particles on primordial nucleosynthesis

Journal Article · · Phys. Rev. D; (United States)
; ;

We modify the standard model for big-bang nucleosynthesis to allow for the presence of a generic particle species, i.e., one which maintains good thermal contact with either the photons or the light-neutrino species throughout the epoch of primordial nucleosynthesis. The production of D, /sup 3/He, /sup 4/He, and /sup 7/Li is calculated as a function of the mass, degrees of freedom, and spin statistics of the generic particle. We show that in general, the effect of an additional generic species cannot simply be parametrized as the equivalent number of additional light-neutrino species. The presence of generic particles also affects the predicted value for the neutrino-to-photon temperature ratio.

Research Organization:
NASA/Fermilab Astrophysics Center, Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, Illinois 60510 and Astronomy and Astrophysics Center, The University of Chicago, Chicago, Illinois 60637
OSTI ID:
5147134
Journal Information:
Phys. Rev. D; (United States), Journal Name: Phys. Rev. D; (United States) Vol. 34:8; ISSN PRVDA
Country of Publication:
United States
Language:
English

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Related Subjects

640106* -- Astrophysics & Cosmology-- Cosmology
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ALGORITHMS
ALKALI METAL ISOTOPES
ANGULAR MOMENTUM
BARYONS
BASIC INTERACTIONS
COSMOLOGICAL MODELS
DEUTERIUM
ELEMENTARY PARTICLES
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
FERMIONS
HADRONS
HELIUM 3
HELIUM 4
HELIUM ISOTOPES
HYDROGEN ISOTOPES
INTERACTIONS
ISOTOPES
LEPTONS
LIGHT NUCLEI
LITHIUM 7
LITHIUM ISOTOPES
MASSLESS PARTICLES
MATHEMATICAL LOGIC
MATHEMATICAL MODELS
MATHEMATICAL SPACE
NEUTRINOS
NEUTRONS
NUCLEI
NUCLEONS
NUCLEOSYNTHESIS
ODD-EVEN NUCLEI
ODD-ODD NUCLEI
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PARTICLE PROPERTIES
PHASE SPACE
PHOTONS
PROTONS
SPACE
SPIN
STABLE ISOTOPES
STATISTICAL MODELS
SYNTHESIS
UNIVERSE
WEAK INTERACTIONS