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

Gelmini, Graciela B.; Kawasaki, Masahiro; Kusenko, Alexander; Murai, Kai; Takhistov, Volodymyr

doi:10.1088/1475-7516/2020/09/051

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

Journal Article · Mon Sep 28 00:00:00 EDT 2020 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2020/09/051· OSTI ID:1735476

Gelmini, Graciela B. ^[1]; Kawasaki, Masahiro ^[2]; Kusenko, Alexander ^[3]; Murai, Kai ^[2]; Takhistov, Volodymyr ^[1]

Univ. of California, Los Angeles, CA (United States)
Univ. of Tokyo, Kashiwa (Japan)
Univ. of California, Los Angeles, CA (United States); Univ. of Tokyo, Kashiwa (Japan)

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 N_eff ≃ 3.2–3.4 and can alleviate the Hubble tension.

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Research Organization:: Univ. of California, Los Angeles, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: SC0009937

OSTI ID:: 1735476

Journal Information:: Journal of Cosmology and Astroparticle Physics, Vol. 2020, Issue 09; ISSN 1475-7516

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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