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Fast-pairwise Collective Neutrino Oscillations Associated with Asymmetric Neutrino Emissions in Core-collapse Supernovae

Journal Article · · The Astrophysical Journal (Online)
 [1];  [2];  [3];  [2]
  1. Princeton Univ, Princeton, NJ (United States). Dept. of Astrophysical Sciences; Princeton University
  2. Waseda Univ., Tokyo (Japan). Dept. of Science and Engineering
  3. Tohoku Univ. (Japan). Dept. of Aerospace Engineering
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We present a linear stability analysis of the fast-pairwise neutrino flavor conversion based on a result of our latest axisymmetric core-collapse supernova (CCSN) simulation with full Boltzmann neutrino transport. In the CCSN simulation, coherent asymmetric neutrino emissions of electron-type neutrinos (νe) and their antiparticles ($$\bar{v}$$e), in which the asymmetries of νe and $$\bar{v}$$e are anticorrelated with each other, occur at almost the same time as the onset of aspherical shock expansion. We find that the asymmetric neutrino emissions play a crucial role on occurrences of fast flavor conversions. The linear analysis shows that unstable modes appear in both pre- and post-shock flows; for the latter, they appear only in the hemisphere of higher $$\bar{v}$$e emissions (the same hemisphere with stronger shock expansion). We analyze the characteristics of electron–lepton number (ELN) crossing in depth by closely inspecting the angular distributions of neutrinos in momentum space. The ELN crossing happens in various ways, and the property depends on the radius: in the vicinity of neutron star, $$\bar{v}$$e (νe) dominates over ve ($$\bar{n}$$e) in the forward (backward) direction; at the larger radius, the ELN crossing occurs in the opposite way. We also find that the non-radial ELN crossing occurs at the boundary between no ELN crossing and the radial one, which is an effect of genuine multi-dimensional transport. Our findings indicate that the collective neutrino oscillation may occur more commonly in CCSNe and suggest that the CCSN community needs to accommodate these oscillations self-consistently in the modeling of CCSNe

Research Organization:
Univ. of California, Oakland, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
SC0018297
OSTI ID:
1803349
Journal Information:
The Astrophysical Journal (Online), Journal Name: The Astrophysical Journal (Online) Journal Issue: 2 Vol. 886; ISSN 1538-4357
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (6)

Late-time behavior of fast neutrino oscillations journal September 2020
Particle-in-cell simulation of the neutrino fast flavor instability journal April 2021
Fast neutrino flavor instability and neutrino flavor lepton number crossings journal May 2022
Dispelling a myth on dense neutrino media: fast pairwise conversions depend on energy text January 2020
Supernova neutrino fluxes in HALO-1kT, Super-Kamiokande, and JUNO text January 2020
Fast collective neutrino oscillations inside the neutrino sphere in core-collapse supernovae journal January 2020

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Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
Astronomy & Astrophysics
Neutrino oscillations
Neutron stars
Nuclear astrophysics
Radiative transfer simulations
Supernova dynamics
Supernova neutrinos