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Title: Neutrino flavor transformation in the lepton-asymmetric universe

Journal Article · · Physical Review D
 [1];  [2];  [3];  [3];  [4]
  1. Univ. of California, San Diego, La Jolla, CA (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of Torino, Torino (Italy)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  4. Univ. of California, San Diego, La Jolla, CA (United States)

We investigate neutrino flavor transformation in the early Universe in the presence of a lepton asymmetry, focusing on a two-flavor system with 1–3 mixing parameters. We identify five distinct regimes that emerge in an approximate treatment neglecting collisions as the initial lepton asymmetry at high temperature is varied from values comparable to current constraints on the lepton number down to values at which the neutrino-neutrino forward-scattering potential is negligible. The characteristic phenomena occurring in these regimes are (1) large synchronized oscillations, (2) minimal flavor transformation, (3) asymmetric (ν- or ν¯-only) MSW, (4) partial MSW, and (5) symmetric MSW. We examine our numerical results in the framework of adiabaticity, and we illustrate how they are modified by collisional damping. Lastly, we point out the existence of matter-neutrino resonances in the early Universe and show that they suffer from nonadiabaticity.

Research Organization:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC52-06NA25396; 257842
OSTI ID:
1329909
Alternate ID(s):
OSTI ID: 1328569
Report Number(s):
LA-UR-16-25128; PRVDAQ
Journal Information:
Physical Review D, Vol. 94, Issue 8; ISSN 2470-0010
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 30 works
Citation information provided by
Web of Science

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Cited By (9)

MeV-scale reheating temperature and thermalization of oscillating neutrinos by radiative and hadronic decays of massive particles journal December 2019
Derivation of the sterile neutrino Boltzmann equation from quantum kinetics journal October 2019
Cosmic QCD Epoch at Nonvanishing Lepton Asymmetry journal November 2018
Neutrino oscillations in a trapping potential journal October 2019
Lepton asymmetry, neutrino spectral distortions, and big bang nucleosynthesis text January 2016
Strange mechanics of the neutrino flavor pendulum text January 2017
Cosmic QCD Epoch at Nonvanishing Lepton Asymmetry text January 2018
Constraining Sterile Neutrino Cosmology with Terrestrial Oscillation Experiments text January 2019
Derivation of the sterile neutrino Boltzmann equation from quantum kinetics text January 2019

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