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Title: Cosmological lepton asymmetry, primordial nucleosynthesis and sterile neutrinos

Abstract

We study post weak decoupling coherent active-sterile and active-active matter-enhanced neutrino flavor transformation in the early Universe. We show that flavor conversion efficiency at Mikheyev-Smirnov-Wolfenstein resonances is likely to be high (adiabatic evolution) for relevant neutrino parameters and energies. However, we point out that these resonances cannot sweep smoothly and continuously with the expansion of the Universe. We show how neutrino flavor conversion in this way can leave both the active and sterile neutrinos with nonthermal energy spectra, and how, in turn, these distorted energy spectra can affect the neutron-to-proton ratio, primordial nucleosynthesis, and cosmological mass/closure constraints on sterile neutrinos. We demonstrate that the existence of a light sterile neutrino which mixes with active neutrinos can change fundamentally the relationship between the cosmological lepton numbers and the primordial nucleosynthesis {sup 4}He yield.

Authors:
 [1];  [2];  [3];  [3];  [4]
  1. Theoretical Division, MS B285, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
  2. Theoretical Astrophysics, Fermi National Accelerator Laboratory, Batavia, Illinois 60510 (United States)
  3. Kavli Institute for Theoretical Physics, University of California, Santa Barbara, California 93106 (United States)
  4. Germany
Publication Date:
OSTI Identifier:
20713515
Resource Type:
Journal Article
Journal Name:
Physical Review. D, Particles Fields
Additional Journal Information:
Journal Volume: 72; Journal Issue: 6; Other Information: DOI: 10.1103/PhysRevD.72.063004; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0556-2821
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ASYMMETRY; COSMIC NEUTRINOS; COSMOLOGY; DECOUPLING; ENERGY SPECTRA; FLAVOR MODEL; HELIUM 4; NEUTRINO OSCILLATION; NEUTRONS; NUCLEAR REACTION YIELD; NUCLEOSYNTHESIS; PROTONS; UNIVERSE

Citation Formats

Abazajian, Kevork, Theoretical Astrophysics, Fermi National Accelerator Laboratory, Batavia, Illinois 60510, Kavli Institute for Theoretical Physics, University of California, Santa Barbara, California 93106, Bell, Nicole F, Kavli Institute for Theoretical Physics, University of California, Santa Barbara, California 93106, Kellogg Radiation Laboratory, California Institute of Technology, Pasadena, California 91125, Fuller, George M, Department of Physics, University of California, San Diego, La Jolla, California 92093-0319, Wong, Yvonne Y. Y., and Deutsches Elektronen-Synchrotron DESY, D-22607 Hamburg. Cosmological lepton asymmetry, primordial nucleosynthesis and sterile neutrinos. United States: N. p., 2005. Web. doi:10.1103/PhysRevD.72.063004.
Abazajian, Kevork, Theoretical Astrophysics, Fermi National Accelerator Laboratory, Batavia, Illinois 60510, Kavli Institute for Theoretical Physics, University of California, Santa Barbara, California 93106, Bell, Nicole F, Kavli Institute for Theoretical Physics, University of California, Santa Barbara, California 93106, Kellogg Radiation Laboratory, California Institute of Technology, Pasadena, California 91125, Fuller, George M, Department of Physics, University of California, San Diego, La Jolla, California 92093-0319, Wong, Yvonne Y. Y., & Deutsches Elektronen-Synchrotron DESY, D-22607 Hamburg. Cosmological lepton asymmetry, primordial nucleosynthesis and sterile neutrinos. United States. https://doi.org/10.1103/PhysRevD.72.063004
Abazajian, Kevork, Theoretical Astrophysics, Fermi National Accelerator Laboratory, Batavia, Illinois 60510, Kavli Institute for Theoretical Physics, University of California, Santa Barbara, California 93106, Bell, Nicole F, Kavli Institute for Theoretical Physics, University of California, Santa Barbara, California 93106, Kellogg Radiation Laboratory, California Institute of Technology, Pasadena, California 91125, Fuller, George M, Department of Physics, University of California, San Diego, La Jolla, California 92093-0319, Wong, Yvonne Y. Y., and Deutsches Elektronen-Synchrotron DESY, D-22607 Hamburg. Thu . "Cosmological lepton asymmetry, primordial nucleosynthesis and sterile neutrinos". United States. https://doi.org/10.1103/PhysRevD.72.063004.
@article{osti_20713515,
title = {Cosmological lepton asymmetry, primordial nucleosynthesis and sterile neutrinos},
author = {Abazajian, Kevork and Theoretical Astrophysics, Fermi National Accelerator Laboratory, Batavia, Illinois 60510 and Kavli Institute for Theoretical Physics, University of California, Santa Barbara, California 93106 and Bell, Nicole F and Kavli Institute for Theoretical Physics, University of California, Santa Barbara, California 93106 and Kellogg Radiation Laboratory, California Institute of Technology, Pasadena, California 91125 and Fuller, George M and Department of Physics, University of California, San Diego, La Jolla, California 92093-0319 and Wong, Yvonne Y. Y. and Deutsches Elektronen-Synchrotron DESY, D-22607 Hamburg},
abstractNote = {We study post weak decoupling coherent active-sterile and active-active matter-enhanced neutrino flavor transformation in the early Universe. We show that flavor conversion efficiency at Mikheyev-Smirnov-Wolfenstein resonances is likely to be high (adiabatic evolution) for relevant neutrino parameters and energies. However, we point out that these resonances cannot sweep smoothly and continuously with the expansion of the Universe. We show how neutrino flavor conversion in this way can leave both the active and sterile neutrinos with nonthermal energy spectra, and how, in turn, these distorted energy spectra can affect the neutron-to-proton ratio, primordial nucleosynthesis, and cosmological mass/closure constraints on sterile neutrinos. We demonstrate that the existence of a light sterile neutrino which mixes with active neutrinos can change fundamentally the relationship between the cosmological lepton numbers and the primordial nucleosynthesis {sup 4}He yield.},
doi = {10.1103/PhysRevD.72.063004},
url = {https://www.osti.gov/biblio/20713515}, journal = {Physical Review. D, Particles Fields},
issn = {0556-2821},
number = 6,
volume = 72,
place = {United States},
year = {2005},
month = {9}
}