Relaxing nucleosynthesis bounds on sterile neutrinos

We have analyzed the constraints arising from nucleosynthesis on possible oscillation between a doublet neutrino ( ν e , ν μ or ν τ ) and a sterile neutrino ( ν s ) in the presence of their couplings to a majoron. The bounds on the mixing angle and mass-squared difference derived previously based on...

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Bibliographic Details
Published inPhysics letters. B Vol. 275; no. 1; pp. 112 - 118
Main Authors Babu, K.S, Rothstein, I.Z
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier B.V 23.01.1992
Elsevier Science
Subjects
Classical and quantum physics: mechanics and fields
Exact sciences and technology
Physics
Theory of quantized fields
Relaxation
Elementary particle
Self energy
Standard model
Cosmology
Energy diagram
Neutrino
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Summary:We have analyzed the constraints arising from nucleosynthesis on possible oscillation between a doublet neutrino ( ν e , ν μ or ν τ ) and a sterile neutrino ( ν s ) in the presence of their couplings to a majoron. The bounds on the mixing angle and mass-squared difference derived previously based on the standard model interactions are found to be weakened by several orders of magnitude. For the case of a 17 keV pseudo-Dirac ν τ , the constraint on the singlet-doublet mass splitting is relaxed to | δm 2|⩽ O(10) eV 2.
ISSN:0370-2693
1873-2445
DOI:10.1016/0370-2693(92)90860-7