Fast neutrino flavor conversion modes in multidimensional core-collapse supernova models: The role of the asymmetric neutrino distributions

Journal Article · Thu Feb 20 00:00:00 EST 2020 · Physical Review. D.

DOI:https://doi.org/10.1103/physrevd.101.043016· OSTI ID:1601660

Abbar, Sajad ^[1]; Duan, Huaiyu  ^[2]; Sumiyoshi, Kohsuke ^[3]; Takiwaki, Tomoya ^[4]; Volpe, Maria Cristina ^[5]

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1. Univ. Denis Diderot, Paris (France); Univ. of New Mexico, Albuquerque, NM (United States)
2. Univ. of New Mexico, Albuquerque, NM (United States)
3. National Inst. of Technology, Numazu College, Ooka Numazu, Shizuoka (Japan)
4. National Astronomical Observatory of Japan, Osawa, Mitaka, Tokyo (Japan)
5. Univ. Denis Diderot, Paris (France)

A dense neutrino gas, such as the one anticipated in the supernova environment, can experience fast neutrino flavor conversions on scales much shorter than those expected in vacuum probably provided that the angular distributions of ν_e and $$\bar{v}_e$$ cross each other. We perform a detailed investigation of the neutrino angular distributions obtained by solving the Boltzmann equations for fixed matter profiles of some representative snapshots during the postbounce phase of core-collapse supernovae in multidimensional calculations of a 11.2 M_⊙ and a 27 M_⊙ progenitor model. Although the 11.2 M_⊙ model features ν_e - $$\bar{v}_e$$ angular crossings and the associated fast modes at different time snapshots, the 27 M_⊙ model does not show any crossings within the decoupling region. We show that this can be understood by studying the multipole components of the neutrino distributions. In fact, there is a higher chance for the occurrence of ν_e - $$\bar{v}_e$$ angular crossings for the zones where the multipole components of the neutrino distributions are strong enough. We also show that there can exist more than one crossing between the angular distributions of ν_e and $$\bar{v}_e$$. In addition, apart from the crossings within the neutrino decoupling region, there is a class of ν_e - $$\bar{v}_e$$ angular crossings that appears very deep inside the protoneutron star.

• Research Organization: Univ. of New Mexico, Albuquerque, NM (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Nuclear Physics (NP)
• Grant/Contract Number: SC0017803
• OSTI ID: 1601660
• Journal Information: Physical Review. D., Vol. 101, Issue 4; ISSN 2470-0010
• Publisher: American Physical Society (APS)
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS