Lepton Asymmetry and Neutrino Oscillations Interplay
arXiv:1302.2923 · doi:10.1007/s10751-013-0790-0
Abstract
We discuss the interplay between lepton asymmetry L and neutrino oscillations in the early Universe. Neutrino oscillations may suppress or enhance previously existing L. On the other hand L is capable to suppress or enhance neutrino oscillations. The mechanism of L enhancement in MSW resonant neutrino oscillations in the early Universe is numerically analyzed. L cosmological effects through neutrino oscillations are discussed. We discuss how L may change the cosmological BBN constraints on neutrino and show that BBN model with electron-sterile neutrino oscillations is extremely sensitive to L - it allows to obtain the most stringent constraints on L value. We discuss also the cosmological role of active-sterile neutrino mixing and L in connection with the indications about additional relativistic density in the early Universe, pointed out by BBN, CMB and LSS data and the analysis of global neutrino data.
11 pages, no figures, based on presentation at the 5th International Symposium on Symmetries in Subatomic Physics, Groningen, The Netherlands, 2012. The final publication is available at link.springer.com
References in corpus (34)
- The Reactor Antineutrino Anomaly
- On the determination of anti-neutrino spectra from nuclear reactors
- A Measurement of the Damping Tail of the Cosmic Microwave Background Power Spectrum with the South Pole Telescope
- Primordial Nucleosynthesis: from precision cosmology to fundamental physics
- The Atacama Cosmology Telescope: Cosmological Parameters from the 2008 Power Spectra
- Cosmological bounds on neutrino degeneracy improved by flavor oscillations
- How Massless Neutrinos Affect the Cosmic Microwave Background Damping Tail
- The primordial abundance of 4He: evidence for non-standard big bang nucleosynthesis
- Are there sterile neutrinos at the eV scale?
- Cosmology seeking friendship with sterile neutrinos
- Sterile neutrinos with eV masses in cosmology -- how disfavoured exactly?
- A New Approach to Systematic Uncertainties and Self-Consistency in Helium Abundance Determinations
- Reconciling sterile neutrinos with big bang nucleosynthesis
- Thermalisation of light sterile neutrinos in the early universe
- Updated BBN bounds on the cosmological lepton asymmetry for non-zero theta13
- BBN bounds on active-sterile neutrino mixing
- Constraints on massive sterile neutrino species from current and future cosmological data
- Solar neutrino spectrum, sterile neutrinos and additional radiation in the Universe
- Relic density of neutrinos with primordial asymmetries
- Light sterile neutrino production in the early universe with dynamical neutrino asymmetries
- Searching for sterile neutrinos in ice
- MiniBooNE and LSND data: non-standard neutrino interactions in a (3+1) scheme versus (3+2) oscillations
- Neutrino oscillations in the early universe: How large lepton asymmetry can be generated?
- Nonequilibrium Neutrino Oscillations and Primordial Production of He-4
- Neutrino degeneracy effect on neutrino oscillations and primordial helium yield
- Cosmological nucleosynthesis and active-sterile neutrino oscillations with small mass differences: The resonant case
- Are Light Sterile Neutrinos Preferred or Disfavored by Cosmology?
- What is half a neutrino? Reviewing cosmological constraints on neutrinos and dark radiation
- Combined analysis of KamLAND and Borexino neutrino signals from Th and U decays in the Earth's interior
- Short-Baseline antinu_mu -> antinu_e Oscillations
- Neutrino Spectrum Distortion Due to Oscillations and its BBN Effect
- Relaxed constraints on neutrino oscillation parameters
- BBN with Late Electron-Sterile Neutrino Oscillations - The Finest Leptometer
- More General BBN Constraints on Neutrino Oscillations Parameters - Relaxed or Strengthened