Cosmological and supernova neutrinos

T. Kajino, W. Aoki, A. B. Balantekin, M. K. Cheoun, T. Hayakawa, J. Hidaka, Y. Hirai, M. Kusakabe, G. J. Mathews, K. Nakamura, Y. Pehlivan, S. Shibagaki, T. Suzuki

    研究成果: Conference contribution

    抄録

    The Big Bang nucleosynthesis (BBN) and the cosmic microwave background (CMB) anisotropies are the pillars of modern cosmology. It has recently been suggested that axion which is a dark matter candidate in the framework of the standard model could condensate in the early universe and induce photon cooling before the epoch of the photon last scattering. Although this may render a solution to the overproduction problem of primordial 7Li abundance, there arises another serious difficulty of overproducing D abundance. We propose a hybrid dark matter model with both axions and relic supersymmetric (SUSY) particles to solve both overproduction problems of the primordial D and 7Li abundances simultaneously. The BBN also serves to constrain the nature of neutrinos. Considering non-thermal photons produced in the decay of the heavy sterile neutrinos due to the magnetic moment, we explore the cosmological constraint on the strength of neutrino magnetic moment consistent with the observed light element abundances. Core-collapse supernovae eject huge flux of energetic neutrinos which affect explosive nucleosynthesis of rare isotopes like 7Li,11B, 92Nb,138La and 180Ta and r-process elements. Several isotopes depend strongly on the neutrino flavor oscillation due to the Mikheyev-Smirnov-Wolfenstein (MSW) effect. Combining the recent experimental constraints on θ13 with predicted and observed supernova-produced abundance ratio 11B/7Li encapsulated in the presolar grains from the Murchison meteorite, we show a marginal preference for an inverted neutrino mass hierarchy. We also discuss supernova relic neutrinos (SRN) that may indicate the softness of the equation of state (EoS) of nuclear matter and adiabatic conditions of the neutrino oscillation.

    本文言語English
    ホスト出版物のタイトルAIP Conference Proceedings
    出版社American Institute of Physics Inc.
    ページ193-200
    ページ数8
    1604
    ISBN(印刷版)9780735412385
    DOI
    出版ステータスPublished - 2014
    イベントWorkshop on Dark Matter, Neutrino Physics and Astrophysics, CETUP* 2013 and 7th International Conference on Interconnections Between Particle Physics and Cosmology, PPC* 2013 - Lead/Deadwood, SD
    継続期間: 2013 6 242013 7 26

    Other

    OtherWorkshop on Dark Matter, Neutrino Physics and Astrophysics, CETUP* 2013 and 7th International Conference on Interconnections Between Particle Physics and Cosmology, PPC* 2013
    CityLead/Deadwood, SD
    Period13/6/2413/7/26

    ASJC Scopus subject areas

    • Physics and Astronomy(all)

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