Amplification of Isocurvature Perturbations induced by Active-Sterile Neutrino Oscillations

Abstract

We show how the generation of a lepton number in the Early Universe induced by active-sterile neutrino oscillations, in presence of small baryon number inhomogeneities, gives rise to the formation of lepton domains, regions with different values of active neutrino chemical potential. The structure of these domains reflects the spectral features of the baryon number inhomogeneities that generated it. An interesting aspect of the mechanism is that the size of lepton domains can be super-horizon.

20 pages + 3 included ps figures

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Cited by in corpus (15)

• Neutrinos in cosmology
• Relic Backgrounds of Gravitational Waves from Cosmic Turbulence
• BBN bounds on active-sterile neutrino mixing
• Update on neutrino mixing in the early Universe
• Neutrino Propagation in Dense Astrophysical Systems
• Generation of Cosmic Magnetic Fields and Gravitational Waves at Neutrino Decoupling
• 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
• Cosmological Implications of Neutrinos
• Addendum to: Update on neutrino mixing in the early Universe
• Active-Sterile neutrino oscillations and BBN+CMBR constraints
• Active-sterile neutrino oscillations in the early Universe: asymmetry generation at low |delta m^2| and the Landau-Zener approximation
• Neutrino oscillations in the early universe. Resonant case
• Comment on ``Neutrino oscillations in the early universe: how can large lepton asymmetry be generated?"
• Big Bang Nucleosynthesis with Gaussian Inhomogeneous Neutrino Degeneracy
• Lepton asymmetries from neutrino oscillations