Supernova neutrinos: flavor-dependent fluxes and spectra

Transporting nu_mu and nu_tau in a supernova (SN) core involves several processes that have been neglected in traditional simulations. Based on a Monte Carlo study we find that the flavor-dependent spectral differences are much smaller than is often stated in the literature. A full-scale SN simulation using a Boltzmann solver and including all relevant neutrino reactions confirms these results. The flavor-dependent flux differences are largest during the initial accretion phase.

[1]  C. Lunardini,et al.  Probing the neutrino mass hierarchy and the 13-mixing with supernovae , 2003 .

[2]  H. Janka,et al.  Improved models of stellar core collapse and still no explosions: what is missing? , 2003, Physical review letters.

[3]  H. Janka,et al.  Electron Neutrino Pair Annihilation: A New Source for Muon and Tau Neutrinos in Supernovae , 2002, astro-ph/0205006.

[4]  Garching,et al.  Explosion Mechanisms of Massive Stars , 2002, astro-ph/0212314.

[5]  H. Janka,et al.  Monte Carlo Study of Supernova Neutrino Spectra Formation , 2002, astro-ph/0208035.

[6]  Keitaro Takahashi,et al.  Effects of Neutrino Oscillation on Supernova Neutrino : Inverted Mass Hierarchy , 2002 .

[7]  H. Janka,et al.  Radiation hydrodynamics with neutrinos - Variable Eddington factor method for core-collapse supernova simulations , 2002, astro-ph/0203101.

[8]  K.Takahashi,et al.  Earth effects on supernova neutrinos and their implications for neutrino parameters , 2001, hep-ph/0110105.

[9]  G.G.Raffelt.  Mu- and Tau-Neutrino Spectra Formation in Supernovae , 2001, astro-ph/0105250.

[10]  G. Raffelt.  Mu- and Tau-Neutrino Spectra Formation in Supernovae , 2001 .

[11]  A. Burrows,et al.  μ and τ neutrino thermalization and production in supernovae: Processes and time scales , 2000, astro-ph/0003054.

[12]  A. Dighe,et al.  Identifying the neutrino mass spectrum from a supernova neutrino burst , 1999, hep-ph/9907423.

[13]  A. Dighe,et al.  Identifying the neutrino mass spectrum from the neutrino burst from a supernova , 1999 .

[14]  G. Raffelt,et al.  Supernova Neutrino Opacity from Nucleon-Nucleon Bremsstrahlung and Related Processes , 1997, astro-ph/9711132.

[15]  H. E. Dalhed,et al.  Future Detection of Supernova Neutrino Burst and Explosion Mechanism , 1997, astro-ph/9710203.

[16]  Janka,et al.  Nucleon spin fluctuations and the supernova emission of neutrinos and axions. , 1996, Physical review letters.

[17]  H. Suzuki.  Supernova neutrinos - multigroup simulations of neutrinos from protoneutron star. , 1993 .

[18]  Hiroaki Suzuki.  Neutrino Emission from Protoneutron Star : with Modified URCA and Nucleon Bremsstrahlung Processes , 1991 .