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Title: Neutrino fast flavor oscillations with moments: Linear stability analysis and application to neutron star mergers

Journal Article · · Physical Review. D.

Providing an accurate modeling of neutrino physics in dense astrophysical environments such as binary neutron star mergers presents a challenge for hydrodynamic simulations. Nevertheless, understanding how flavor transformation can occur and affect the dynamics, the mass ejection, and the nucleosynthesis will need to be achieved in the future. Computationally expensive, large-scale simulations frequently evolve the first classical angular moments of the neutrino distributions. By promoting these quantities to matrices in flavor space, we develop a linear stability analysis of fast flavor oscillations using only the first two “quantum” moments, which notably requires generalizing the classical closure relations that appropriately truncate the hierarchy of moment equations in order to treat quantum flavor coherence. After showing the efficiency of this method on a well-understood test situation, we perform a systematic search of the occurrence of fast flavor instabilities in a neutron star merger simulation. Here, we discuss the successes and shortcomings of moment linear stability analysis, as this framework provides a time-efficient way to design and study better closure prescriptions in the future.

Research Organization:
North Carolina State University, Raleigh, NC (United States); Univ. of New Hampshire, Durham, NH (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP); National Science Foundation (NSF); National Aeronautics and Space Administration (NASA)
Grant/Contract Number:
FG02-02ER41216; PHY-2020275; SC00268442; AC02-05CH11231; 80NSSC22K0719; AST-2107932; FG0202ER41216
OSTI ID:
2311835
Alternate ID(s):
OSTI ID: 2311839; OSTI ID: 2474090
Report Number(s):
N3AS-23-032; TRN: US2409190
Journal Information:
Physical Review. D., Vol. 109, Issue 4; ISSN 2470-0010
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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