Impact of eV-mass sterile neutrinos on neutrino-driven supernova outflows

doi:https://doi.org/10.1088/1475-7516/2012/01/013

Title: Impact of eV-mass sterile neutrinos on neutrino-driven supernova outflows

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Abstract

Motivated by recent hints for sterile neutrinos from the reactor anomaly, we study active-sterile conversions in a three-flavor scenario (2 active + 1 sterile families) for three different representative times during the neutrino-cooling evolution of the proto-neutron star born in an electron-capture supernova. In our ''early model'' (0.5 s post bounce), the ν{sub e}-ν{sub s} MSW effect driven by Δm{sup 2} = 2.35eV{sup 2} is dominated by ordinary matter and leads to a complete ν{sub e}-ν{sub s} swap with little or no trace of collective flavor oscillations. In our ''intermediate'' (2.9 s p.b.) and ''late models'' (6.5 s p.b.), neutrinos themselves significantly modify the ν{sub e}-ν{sub s} matter effect, and, in particular in the late model, νν refraction strongly reduces the matter effect, largely suppressing the overall ν{sub e}-ν{sub s} MSW conversion. This phenomenon has not been reported in previous studies of active-sterile supernova neutrino oscillations. We always include the feedback effect on the electron fraction Y{sub e} due to neutrino oscillations. In all examples, Y{sub e} is reduced and therefore the presence of sterile neutrinos can affect the conditions for heavy-element formation in the supernova ejecta, even if probably not enabling the r-process in the investigated outflows of anmore »« less

Authors:

Tamborra, Irene; Raffelt, Georg G. ^[1]; Hüdepohl, Lorenz; Janka, Hans-Thomas ^[2]

Max-Planck-Institut für Physik (Werner-Heisenberg-Institut), Föhringer Ring 6, 80805 München (Germany)
Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str. 1, 85748 Garching (Germany)

Publication Date:: 2012-01-01

OSTI Identifier:: 22279721

Resource Type:: Journal Article

Journal Name:: Journal of Cosmology and Astroparticle Physics

Additional Journal Information:: Journal Volume: 2012; Journal Issue: 01; 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; ASTROPHYSICS; COSMOLOGY; ELECTRON CAPTURE; ELECTRONS; EV RANGE; FLAVOR MODEL; NEUTRINO OSCILLATION; NEUTRINOS; NEUTRON STARS; OSCILLATIONS; PROTOSTARS; R PROCESS; REFRACTION; SUPERNOVAE

Citation Formats


                    Tamborra, Irene, Raffelt, Georg G., Hüdepohl, Lorenz, and Janka, Hans-Thomas. Impact of eV-mass sterile neutrinos on neutrino-driven supernova outflows.  United States: N. p., 2012. 
        Web.  doi:10.1088/1475-7516/2012/01/013.

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                    Tamborra, Irene, Raffelt, Georg G., Hüdepohl, Lorenz, & Janka, Hans-Thomas. Impact of eV-mass sterile neutrinos on neutrino-driven supernova outflows.  United States.  https://doi.org/10.1088/1475-7516/2012/01/013

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                    Tamborra, Irene, Raffelt, Georg G., Hüdepohl, Lorenz, and Janka, Hans-Thomas. Sun .  
        "Impact of eV-mass sterile neutrinos on neutrino-driven supernova outflows".  United States.  https://doi.org/10.1088/1475-7516/2012/01/013.

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@article{osti_22279721,

  title        = {Impact of eV-mass sterile neutrinos on neutrino-driven supernova outflows},

  author       = {Tamborra, Irene and Raffelt, Georg G. and Hüdepohl, Lorenz and Janka, Hans-Thomas},

  abstractNote = {Motivated by recent hints for sterile neutrinos from the reactor anomaly, we study active-sterile conversions in a three-flavor scenario (2 active + 1 sterile families) for three different representative times during the neutrino-cooling evolution of the proto-neutron star born in an electron-capture supernova. In our ''early model'' (0.5 s post bounce), the ν{sub e}-ν{sub s} MSW effect driven by Δm{sup 2} = 2.35eV{sup 2} is dominated by ordinary matter and leads to a complete ν{sub e}-ν{sub s} swap with little or no trace of collective flavor oscillations. In our ''intermediate'' (2.9 s p.b.) and ''late models'' (6.5 s p.b.), neutrinos themselves significantly modify the ν{sub e}-ν{sub s} matter effect, and, in particular in the late model, νν refraction strongly reduces the matter effect, largely suppressing the overall ν{sub e}-ν{sub s} MSW conversion. This phenomenon has not been reported in previous studies of active-sterile supernova neutrino oscillations. We always include the feedback effect on the electron fraction Y{sub e} due to neutrino oscillations. In all examples, Y{sub e} is reduced and therefore the presence of sterile neutrinos can affect the conditions for heavy-element formation in the supernova ejecta, even if probably not enabling the r-process in the investigated outflows of an electron-capture supernova. The impact of neutrino-neutrino refraction is strong but complicated, leaving open the possibility that with a more complete treatment, or for other supernova models, active-sterile neutrino oscillations could generate conditions suitable for the r-process.},

  doi          = {10.1088/1475-7516/2012/01/013},

  url          = {https://www.osti.gov/biblio/22279721},
  journal      = {Journal of Cosmology and Astroparticle Physics},

  issn         = {1475-7516},

  number       = 01,

  volume       = 2012,

  place        = {United States},

  year         = {2012},

  month        = {1}

}

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