Probing lepton asymmetry with 21 cm fluctuations

Kohri, Kazunori; Oyama, Yoshihiko; Sekiguchi, Toyokazu; Takahashi, Tomo

doi:10.1088/1475-7516/2014/09/014

Title: Probing lepton asymmetry with 21 cm fluctuations

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Abstract

We investigate the issue of how accurately we can constrain the lepton number asymmetry ξ{sub ν}=μ{sub ν}/T{sub ν} in the Universe by using future observations of 21 cm line fluctuations and cosmic microwave background (CMB). We find that combinations of the 21 cm line and the CMB observations can constrain the lepton asymmetry better than big-bang nucleosynthesis (BBN). Additionally, we also discuss constraints on ξ{sub ν} in the presence of some extra radiation, and show that the 21 cm line observations can substantially improve the constraints obtained by CMB alone, and allow us to distinguish the effects of the lepton asymmetry from the ones of extra radiation.

Authors:

Kohri, Kazunori; Oyama, Yoshihiko ^[1]; Sekiguchi, Toyokazu ^[2]; Takahashi, Tomo ^[3]

The Graduate University for Advanced Studies (Sokendai), 1-1 Oho, Tsukuba 305-0801 (Japan)
Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8602 (Japan)
Department of Physics, Saga University, Saga 840-8502 (Japan)

Publication Date:: Mon Sep 01 00:00:00 EDT 2014

OSTI Identifier:: 22375897

Resource Type:: Journal Article

Journal Name:: Journal of Cosmology and Astroparticle Physics

Additional Journal Information:: Journal Volume: 2014; Journal Issue: 09; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1475-7516

Country of Publication:: United States

Language:: English

Subject:: 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASYMMETRY; FLUCTUATIONS; LEPTON NUMBER; LEPTONS; NUCLEOSYNTHESIS; PROBES; RELICT RADIATION; UNIVERSE

Citation Formats


                    Kohri, Kazunori, Oyama, Yoshihiko, Sekiguchi, Toyokazu, and Takahashi, Tomo. Probing lepton asymmetry with 21 cm fluctuations.  United States: N. p., 2014. 
        Web.  doi:10.1088/1475-7516/2014/09/014.

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                    Kohri, Kazunori, Oyama, Yoshihiko, Sekiguchi, Toyokazu, & Takahashi, Tomo. Probing lepton asymmetry with 21 cm fluctuations.  United States.  https://doi.org/10.1088/1475-7516/2014/09/014

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                    Kohri, Kazunori, Oyama, Yoshihiko, Sekiguchi, Toyokazu, and Takahashi, Tomo. 2014.  
        "Probing lepton asymmetry with 21 cm fluctuations".  United States.  https://doi.org/10.1088/1475-7516/2014/09/014.

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@article{osti_22375897,

  title        = {Probing lepton asymmetry with 21 cm fluctuations},

  author       = {Kohri, Kazunori and Oyama, Yoshihiko and Sekiguchi, Toyokazu and Takahashi, Tomo},

  abstractNote = {We investigate the issue of how accurately we can constrain the lepton number asymmetry ξ{sub ν}=μ{sub ν}/T{sub ν} in the Universe by using future observations of 21 cm line fluctuations and cosmic microwave background (CMB). We find that combinations of the 21 cm line and the CMB observations can constrain the lepton asymmetry better than big-bang nucleosynthesis (BBN). Additionally, we also discuss constraints on ξ{sub ν} in the presence of some extra radiation, and show that the 21 cm line observations can substantially improve the constraints obtained by CMB alone, and allow us to distinguish the effects of the lepton asymmetry from the ones of extra radiation.},

  doi          = {10.1088/1475-7516/2014/09/014},

  url          = {https://www.osti.gov/biblio/22375897},
  journal      = {Journal of Cosmology and Astroparticle Physics},

  issn         = {1475-7516},

  number       = 09,

  volume       = 2014,

  place        = {United States},

  year         = {Mon Sep 01 00:00:00 EDT 2014},

  month        = {Mon Sep 01 00:00:00 EDT 2014}

}

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https://doi.org/10.1088/1475-7516/2014/09/014

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