Amplification of Isocurvature Perturbations induced by Active-Sterile Neutrino Oscillations
نویسنده
چکیده
We show how the generation of a lepton number in the Early Universe induced by να ↔ νs, in presence of small baryon number inhomogeneities, gives rise to the formation of lepton domains. The structure of these domains reflects the spectral features of the baryon number inhomogeneities that generated it and interestingly the size of the lepton domains can be super-horizon. PACS numbers: 14.60.Pq; 14.60.St; 98.80.Bp;11.30.Fs keywords: early universe, neutrino oscillations, sterile neutrino, baryon isocurvature perturbations, leptogenesis.
منابع مشابه
Chaotic amplification of neutrino chemical potentials by neutrino oscillations in big bang nucleosynthesis.
We investigate in detail the parameter space of active-sterile neutrino oscillations that amplifies neutrino chemical potentials at the epoch of Big Bang Nucleosynthesis. We calculate the magnitude of the amplification and show evidences of chaos in the amplification process. We also discuss the implications of the neutrino chemical potential amplification in the Big Bang Nucleosynthesis. It is...
متن کاملCreation of large spatial fluctuations in neutrino asymmetry by neutrino oscillations
We consider active-sterile neutrino oscillations in the early universe in an inhomogeneous isocurvature background. We show that very small initial baryonic seed-inhomogeneities can trigger a growth of very large amplitude spatial fluctuations in lepton asymmetry. Domains of varying asymmetry are observed to persist for a long time despite dissipative effects. The space dependent asymmetry prof...
متن کاملv 2 1 0 A ug 2 00 1 CERN - TH / 2001 - 214 IFIC - 01 - 43 hep - ph / 0108073 Update on Solar and Atmospheric Four - Neutrino Oscillations ∗
In this talk we present the update (including the recent SNO results) of our analysis of the neutrino oscillation solutions of the solar and atmospheric neutrino problems in the framework of four-neutrino mixing where a sterile neutrino is added to the three standard ones and the mass spectra present two separated doublets. Such scenarios allow for simultaneous transitions of solar νe, as well ...
متن کاملSolar and Atmospheric Four–Neutrino Oscillations
We present an analysis of the neutrino oscillation solutions of the solar and atmospheric neutrino problems in the framework of four–neutrino mixing where a sterile neutrino is added to the three standard ones and the mass spectra presents two separated doublets. Such scenarios allow for simultaneous transitions of solar νe, as well as atmospheric νμ, into active and sterile neutrinos controlle...
متن کاملActive - Sterile neutrino oscillations and BBN + CMBR constraints
We show how active-sterile neutrino oscillations in the early Universe can play an interesting role in explaining the current observations of CMBR anisotropies and light element abundances. We describe different possible phenomenological scenarios in the interpretation of present data and how active-sterile neutrino oscillations can provide a viable theoretical framework.
متن کامل