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Title: Big bang nucleosynthesis constraints on sterile neutrino and lepton asymmetry of the Universe

Abstract

We consider the cosmological effects of sterile neutrinos with the masses of 150–450 MeV. The decay of sterile neutrinos changes the thermal history of the Universe and affects the energy density of radiation at the recombination and the big bang nucleosynthesis (BBN) results. We derive severe constraints on the parameters of sterile neutrinos from the primordial abundances of helium-4 and deuterium. We also find that in a particular model the constraints can be considerably relaxed by assuming a large lepton asymmetry in the active neutrinos. In this case, the consistent parameters result in Neff ≃ 3.2–3.4 and can alleviate the Hubble tension.

Authors:
 [1];  [2];  [3];  [2];  [1]
  1. Univ. of California, Los Angeles, CA (United States)
  2. Univ. of Tokyo, Kashiwa (Japan)
  3. Univ. of California, Los Angeles, CA (United States); Univ. of Tokyo, Kashiwa (Japan)
Publication Date:
Research Org.:
Univ. of California, Los Angeles, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP)
OSTI Identifier:
1735476
Grant/Contract Number:  
SC0009937
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2020; Journal Issue: 09; Journal ID: ISSN 1475-7516
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Big bang nucleosynthesis; cosmological neutrinos

Citation Formats

Gelmini, Graciela B., Kawasaki, Masahiro, Kusenko, Alexander, Murai, Kai, and Takhistov, Volodymyr. Big bang nucleosynthesis constraints on sterile neutrino and lepton asymmetry of the Universe. United States: N. p., 2020. Web. doi:10.1088/1475-7516/2020/09/051.
Gelmini, Graciela B., Kawasaki, Masahiro, Kusenko, Alexander, Murai, Kai, & Takhistov, Volodymyr. Big bang nucleosynthesis constraints on sterile neutrino and lepton asymmetry of the Universe. United States. https://doi.org/10.1088/1475-7516/2020/09/051
Gelmini, Graciela B., Kawasaki, Masahiro, Kusenko, Alexander, Murai, Kai, and Takhistov, Volodymyr. Mon . "Big bang nucleosynthesis constraints on sterile neutrino and lepton asymmetry of the Universe". United States. https://doi.org/10.1088/1475-7516/2020/09/051. https://www.osti.gov/servlets/purl/1735476.
@article{osti_1735476,
title = {Big bang nucleosynthesis constraints on sterile neutrino and lepton asymmetry of the Universe},
author = {Gelmini, Graciela B. and Kawasaki, Masahiro and Kusenko, Alexander and Murai, Kai and Takhistov, Volodymyr},
abstractNote = {We consider the cosmological effects of sterile neutrinos with the masses of 150–450 MeV. The decay of sterile neutrinos changes the thermal history of the Universe and affects the energy density of radiation at the recombination and the big bang nucleosynthesis (BBN) results. We derive severe constraints on the parameters of sterile neutrinos from the primordial abundances of helium-4 and deuterium. We also find that in a particular model the constraints can be considerably relaxed by assuming a large lepton asymmetry in the active neutrinos. In this case, the consistent parameters result in Neff ≃ 3.2–3.4 and can alleviate the Hubble tension.},
doi = {10.1088/1475-7516/2020/09/051},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 09,
volume = 2020,
place = {United States},
year = {2020},
month = {9}
}

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