Effects of active-sterile neutrino mixing during primordial nucleosynthesis

Abstract

In the present work, we discuss the effects of the inclusion of sterile-active neutrino oscillations during the production of primordial light-nuclei. We assume that the sterile neutrino mass-eigenstate might oscillate with the two lightest active neutrino mass- eigenstates, with mixing angles ${\varphi }_1$ and ${\varphi }_2$. We also allow a constant renormalization (represented by a parameter ($\zeta$)) of the sterile neutrino occupation factor. Taking $\zeta$ and the mixing angles as free parameters, we have computed distribution functions of active and sterile neutrinos and primordial abundances. Using observable data we set constrains in the free parameters of the model. It is found that the data on primordial abundances are consistent with small mixing angles and with a value of $\zeta$ smaller than 0.65 at 3$\sigma$ level.

8 pages

References in corpus (10)

• Observation of electron-antineutrino disappearance at Daya Bay
• Measurement of Neutrino Oscillation by the K2K Experiment
• Measurement of the solar neutrino capture rate with gallium metal. III: Results for the 2002--2007 data-taking period
• Deuterium Abundance in the Most Metal-Poor Damped Lyman alpha System: Converging on Omega_baryons
• Additional Light Sterile Neutrinos and Cosmology
• HD/H2 Molecular Clouds in the Early Universe: The Problem of Primordial Deuterium
• Probing the Effective Number of Neutrino Species with Cosmic Microwave Background
• Coherent Active-Sterile Neutrino Flavor Transformation in the Early Universe
• Light Element Signatures of Sterile Neutrinos and Cosmological Lepton Numbers
• Testing Primordial Abundances With Sterile Neutrinos

Cited by in corpus (1)

• Neutrino mixing in nuclear rapid neutron-capture processes