How neutrino oscillations can induce an effective neutrino number of less than 3 during Big Bang Nucleosynthesis

Abstract

Ordinary-sterile neutrino oscillations can generate significant neutrino asymmetry in the early Universe. In this paper we extend this work by computing the evolution of neutrino asymmetries and light element abundances during the Big Bang Nucleosynthesis (BBN) epoch. We show that a significant electron-neutrino asymmetry can be generated in a way that is approximately independent of the oscillation parameters $\delta m^2$ and ${\sin }^{2}2\theta$ for a range of parameters in an interesting class of models. The numerical value of the asymmetry leads to the prediction that the effective number of neutrino flavours during BBN is either about 2.5 or 3.4 depending on the sign of the asymmetry. Interestingly, one class of primordial deuterium abundance data favours an effective number of neutrino flavours during the epoch of BBN of less than 3.

arXiv comment22 pages, LaTeX, 2 figures

References in corpus (22)

• Neutrino physics and the mirror world: how exact parity symmetry explains the solar neutrino deficit, the atmospheric neutrino anomaly and the LSND experiment
• Reconciling Dark Matter, Solar and Atmospheric Neutrinos
• Big Bang Nucleosynthesis in Crisis?
• Large neutrino asymmetries from neutrino oscillations
• A sterile neutrino scenario constrained by experiments and cosmology
• Studies of neutrino asymmetries generated by ordinary-sterile neutrino oscillations in the early universe and implications for big bang nucleosynthesis bounds
• Accelerator, reactor, solar and atmospheric neutrino oscillation: beyond three generations
• Chaotic Amplification of Neutrino Chemical Potentials by Neutrino Oscillations in Big Bang Nucleosynthesis
• Model of Four Light Neutrinos in the Light of All Present Data
• Neutrino Masses
• On The Vacuum Oscillation Solution of The Solar Neutrino Problem
• Is Zee Model The Model of Neutrino Masses?
• Neutrino oscillations and the exact parity model
• Cosmological Implications of Two Conflicting Deuterium Abundances
• Accomodating Solar and Atmospheric Neutrino Deficits, Hot Dark Matter, and a Double Beta Decay Signal
• A Wavelet Space-Scale-Decomposition Analysis of Structure and Evolution fo QSO's Ly$\alpha$ Absorption Lines
• No Crisis for Big Bang Nucleosynthesis
• Nonequilibrium Neutrino Oscillations and Primordial Production of He-4
• A Big Bang Nucleosynthesis Likelihood Analysis of the Baryon-to-Photon Ratio and the Number of Light Particle Degrees of Freedom
• Framework for Naturally Light Singlet Neutrinos
• A complete solution to neutrino mixing
• ARE THERE STERILE NEUTRINOS IN THE FLUX OF SOLAR NEUTRINOS ON THE EARTH?

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• Probing oscillations into sterile neutrinos with cosmology, astrophysics and experiments
• (3+1)-spectrum of neutrino masses: A chance for LSND?
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• Do many-particle neutrino interactions cause a novel coherent effect?
• A Mechanism for Ordinary-Sterile Neutrino Mixing
• Sterile neutrinos, lepton asymmetries, primordial elements: how much of each?
• Update on neutrino mixing in the early Universe
• Comparing and contrasting the ${\nu }_{\mu }\to {\nu }_{\tau }$ and ${\nu }_{\mu }\to {\nu }_s$ solutions to the atmospheric neutrino problem with SuperKamiokande data
• Active-active and active-sterile neutrino oscillation solutions to the atmospheric neutrino anomaly
• Comparison of ν_μ<-> ν_τand and ν_μ<-> ν_s oscillations as solutions of the atmospheric neutrino problem
• Neutrino Propagation in Dense Astrophysical Systems
• Bounds on neutrino-scalar nonstandard interactions from big bang nucleosynthesis
• Relic neutrino asymmetries and big bang nucleosynthesis in a four neutrino model
• Cosmological nucleosynthesis and active-sterile neutrino oscillations with small mass differences: The resonant case
• Implications of mirror neutrinos for early universe cosmology
• Further studies on relic neutrino asymmetry generation I: the adiabatic Boltzmann limit, non-adiabatic evolution, and the classical harmonic oscillator analogue of the quantum kinetic equations
• Blocking Active-Sterile Neutrino Oscillations in the Early Universe with a Majoron Field
• Addendum to: Update on neutrino mixing in the early Universe
• Implications of the ${\nu }_{\mu }\to {\nu }_s$ solution to the atmospheric neutrino anomaly for early Universe cosmology
• Active-Sterile neutrino oscillations and BBN+CMBR constraints
• The ${\nu }_{\mu }\leftrightarrow {\nu }_s$ interpretation of the atmospheric neutrino data and cosmological constraints
• Imprint of Sterile Neutrinos in the Cosmic Microwave Background Radiation
• On chaoticity of the amplification of the neutrino asymmetry in the early universe
• Pseudo-Dirac neutrinos as a potential complete solution to the neutrino oscillation puzzle
• On the sign of the neutrino asymmetry induced by active-sterile neutrino oscillations in the early Universe
• Neutrino-Mixing-Generated Lepton Asymmetry and the Primordial ${}^4$He Abundance
• Joint constraints on the lepton asymmetry of the Universe and neutrino mass from the Wilkinson Microwave Anisotropy Probe
• Matter-affected neutrino oscillations in ordinary and mirror stars and their implications for gamma-ray bursts
• Big Bang Nucleosynthesis and Active-Sterile Neutrino Mixing: Evidence for Maximal Mu Neutrino <-> Tau Neutrino Mixing in Super Kamiokande?
• Active-sterile neutrino oscillations in the early Universe: asymmetry generation at low |delta m^2| and the Landau-Zener approximation
• Detailed study of BBN implications of neutrino oscillation generated neutrino asymmetries in some four neutrino models
• Neutrino oscillations in the early universe. Resonant case
• BBN with Late Electron-Sterile Neutrino Oscillations - The Finest Leptometer
• The Increase in the Primordial He-4 Yield in the Two-Doublet Four-Neutrino Mixing Scheme
• Maximum lepton asymmetry from active-sterile neutrino oscillations in the Early Universe
• Lepton asymmetry creation in the Early Universe
• Maximal ${\nu }_{\mu }-{\nu }_{\tau }$ oscillations, the see-saw mechanism and the Exact Parity Model
• Neutrino Masses in Astrophysics and Cosmology
• Neutrino oscillations and Big Bang Nucleosynthesis
• Relic neutrino asymmetry generation from ${\nu }_{\alpha }-{\nu }_s$ oscillations
• The Phenomenology of Sphaleron in Modified Mirror Model