Oscillation Induced Neutrino Asymmetry Growth in the Early Universe

Abstract

We study the dynamics of active-sterile neutrino oscillations in the early universe using full momentum-dependent quantum-kinetic equations. These equations are too complicated to allow for an analytical treatment, and numerical solution is greatly complicated due to very pronounced and narrow structures in the momentum variable introduced by resonances. Here we introduce a novel dynamical discretization of the momentum variable which overcomes this problem. As a result we can follow the evolution of neutrino ensemble accurately well into the stable growing phase. Our results confirm the existence of a "chaotic region" of mixing parameters, for which the final sign of the asymmetry, and hence the SBBN prediction of He(4)-abundance cannot be accurately determined.

23 pages, 9 eps-figs, Latex, uses JHEP class

References in corpus (9)

• Constraints on Neutrino Oscillations Using 1258 Days of Super-Kamiokande Solar Neutrino Data
• Sterile Neutrino Hot, Warm, and Cold Dark Matter
• Primordial Nucleosynthesis with CMB Inputs: Probing the Early Universe and Light Element Astrophysics
• Update on neutrino mixing in the early Universe
• Cornering (3+1) sterile neutrino schemes
• Neutrino oscillations in the early universe. Resonant case
• High energy photon-neutrino elastic scattering
• BRST construction of D-branes in SU(2) WZW model
• Creation of large spatial fluctuations in neutrino asymmetry by neutrino oscillations

Cited by in corpus (11)

• Physics Interplay of the LHC and the ILC
• Towards a precision calculation of $N_{\mathrm{eff}}$ in the Standard Model II: Neutrino decoupling in the presence of flavour oscillations and finite-temperature QED
• Sterile neutrinos in cosmology
• How secret interactions can reconcile sterile neutrinos with cosmology
• Thermalisation of light sterile neutrinos in the early universe
• Cosmology with self-interacting sterile neutrinos and dark matter - A pseudoscalar model
• Probing secret interactions of eV-scale sterile neutrinos with the diffuse supernova neutrino background
• Active-sterile neutrino oscillations in the early Universe with full collision terms
• Can active-sterile neutrino oscillations lead to chaotic behavior of the cosmological lepton asymmetry?
• Momentum distributions of cosmic relics: Improved analysis
• Chaos, Determinacy and Fractals in Active-Sterile Neutrino Oscillations in the Early Universe