2026-05-25 早稲田大学
図1：比エントロピー(衝撃波を膨張させる勢いの指標)の分布を、フレーバー変換なし(左)とフレーバー変換あり(右)で比較したもの。赤い領域がフレーバー変換発生領域で、そこを通ったニュートリノの平均エネルギーが高まり、ニュートリノ加熱率が上昇したことで衝撃波が広がっている。
＜関連情報＞
- https://www.waseda.jp/inst/research/news/84500
- https://journals.aps.org/prl/abstract/10.1103/fksy-1jtw
多角度ニュートリノ放射流体力学によって明らかになった、ニュートリノ高速フレーバー変換が中心核崩壊型超新星に及ぼす二極化影響 Bifurcated Impact of Neutrino Fast Flavor Conversion on Core-Collapse Supernovae Informed by Multiangle Neutrino Radiation Hydrodynamics
Ryuichiro Akaho, Hiroki Nagakura, Wakana Iwakami, Shun Furusawa, Akira Harada,, Hirotada Okawa, Hideo Matsufuru, Kohsuke Sumiyoshi, and Shoichi Yamada
Physical Review Letters Published: 11 May, 2026
DOI: https://doi.org/10.1103/fksy-1jtw
Abstract
In this Letter, we present a compelling and robust argument for the roles of neutrino fast flavor conversion (FFC) in the explosion mechanism of core-collapse supernova (CCSN), combining the multiangle FFC subgrid model rooted in quantum kinetic theory with the multidimensional four-species Boltzmann neutrino radiation hydrodynamics. Employing various progenitor masses and the nuclear equations of states, we find that the effect of FFC on CCSN explosion is bifurcated depending on the progenitors. For the lowest-mass progenitor, FFC facilitates the shock revival and enhances the explosion energy, whereas for higher-mass progenitors its impact is inhibitory. We identify the mass accretion rate as the key determinant governing this bifurcation. When the mass accretion rate is low (high), the contribution of FFC to neutrino heating becomes positive (negative) because the heating efficiency enhancement via FFC-driven spectral hardening of electron-type neutrinos dominates over (is outweighed by) the concurrent reduction in neutrino luminosity. Our results further highlight the limitations of approximate neutrino transport and demonstrate that a multiangle treatment is essential for accurately capturing FFC effects; otherwise, FFCs are missed and even generated spuriously.
