Neutrino fast flavor instability in three dimensions for a neutron star merger

被引：28

作者：

Grohs, Evan ^{[1
]}

Richers, Sherwood ^{[2
]}

Couch, Sean M. ^{[3
,4
,5
]}

Foucart, Francois ^{[6
]}

Kneller, James P. ^{[1
]}

McLaughlin, G. C. ^{[1
]}

机构：

[1] North Carolina State Univ, Dept Phys, Raleigh, NC 27695 USA

[2] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

[3] Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA

[4] Michigan State Univ, Dept Computat Math Sci & Engn, E Lansing, MI 48824 USA

[5] Michigan State Univ, Facil Rare Isotope Beams, E Lansing, MI 48824 USA

[6] Univ New Hampshire, Dept Phys & Astron, Durham, NH 03824 USA

来源：

PHYSICS LETTERS B | 2023年 / 846卷

基金：

美国国家科学基金会;

关键词：

Neutrino flavor transformation; Neutron star mergers; Nuclear astrophysics; SUPERNOVA SIMULATIONS; NUCLEOSYNTHESIS; HYDRODYNAMICS; OSCILLATIONS; TRANSPORT; CODE;

D O I：

10.1016/j.physletb.2023.138210

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The flavor evolution of neutrinos in core collapse supernovae and neutron star mergers is a critically important unsolved problem in astrophysics. Following the electron flavor evolution of the neutrino system is essential for calculating the thermodynamics of compact objects as well as the chemical elements they produce. Accurately accounting for flavor transformation in these environments is challenging for a number of reasons, including the large number of neutrinos involved, the small spatial scale of the oscillation, and the nonlinearity of the system. We take a step in addressing these issues by presenting a method which describes the neutrino fields in terms of angular moments. We apply our moment method to neutron star merger conditions and show it simulates fast flavor neutrino transformation in a region where this phenomenon is expected to occur. By comparing with particle -in-cell calculations we show that the moment method is able to capture the three phases of growth, saturation, and decoherence, and correctly predicts the lengthscale of the fastest growing fluctuations in the neutrino field.(c) 2023 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons .org /licenses /by /4 .0/). Funded by SCOAP3.

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