Almost-standard big-bang nucleosynthesis with. Omega. sub B h2 sup 0. much gt. 0. 015: A reexamination of neutrino chemical potentials and. Delta. G

Journal Article · Wed Jan 15 00:00:00 EST 1992 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.45.476· OSTI ID:5083899

Starkman, G D ^[1]

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1. Institute for Advanced Study, Princeton, New Jersey 08540 (United States)

The homogeneous standard big-bang nucleosynthesis (SBBN) yields of D, {sup 3}He, {sup 4}He, and {sup 7}Li are computed allowing independent variations of {mu}{sub 1}, the chemical potential for electron neutrinos, and {mu}{sub 2}, the chemical potential of {mu} neutrinos (or equivalently of {ital Gg}{sub {ital R}}, the product of Newton's constant and the number of effective relativistic degrees of freedom at the epoch of nucleosynthesis). This follows up previous investigations of chemical-potential variations, which however considered only ({sup 7}Li)/(H){congruent}10{sup {minus}9}. It is found that even with a primordial {sup 7}Li abundance of 10{sup {minus}10} the hydrogen abundance {Omega}{sub {ital B}h0}{sup 2}{similar to}0.1 is permitted as is {Omega}{sub {ital B}h0}{sup 2}{similar to}1; however, the required chemical potential for the {nu}{sub {ital e}} is {mu}{sub 1}{approx}{ital T}. The required chemical potential for {nu}{sub {mu}} and/or {nu}{sub {tau}} is {mu}{sub 2}{approx}(5--25){ital T} (for {Omega}{sub {ital B}h0}{sup 2}{congruent}0.1 and 1, respectively), or equivalently ({ital Gg}{sub {ital R}}){approx}(few--10{sup 3})({ital Gg}{sub {ital R}}){sub SBBN}. Thus baryonic dark matter may be incorporated into the standard big-bang nucleosynthesis model albeit with dramatic requirements for lepto-genesis and/or the constancy of the gravitational coupling. It is also found that the lithium dip'' tracks the primordial deuterium abundance and thus may not be an independent measure of the parameters of the SBBN model.

• OSTI ID: 5083899
• Journal Information: Physical Review, D (Particles Fields); (United States), Vol. 45:2; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
COSMOLOGICAL MODELS
NUCLEOSYNTHESIS
ELECTRON NEUTRINOS
POTENTIALS
MUON NEUTRINOS
ABUNDANCE
COUPLING
DEUTERIUM
GRAVITATIONAL FIELDS
HELIUM 3
HELIUM 4
HYDROGEN
LITHIUM 7
NONLUMINOUS MATTER
STANDARD MODEL
UNIVERSE
ALKALI METAL ISOTOPES
ELEMENTARY PARTICLES
ELEMENTS
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
FERMIONS
HELIUM ISOTOPES
HYDROGEN ISOTOPES
ISOTOPES
LEPTONS
LIGHT NUCLEI
LITHIUM ISOTOPES
MASSLESS PARTICLES
MATHEMATICAL MODELS
MATTER
NEUTRINOS
NONMETALS
NUCLEI
ODD-EVEN NUCLEI
ODD-ODD NUCLEI
PARTICLE MODELS
STABLE ISOTOPES
SYNTHESIS
UNIFIED GAUGE MODELS
662310* - Weak & Electromagnetic Interactions of Leptons- (1992-)