2025-09-19 ペンシルベニア州立大学（PennState）
New simulations of neutron star mergers reveal that the mixing and changing of tiny particles called neutrinos impacts how the merger unfolds, including the composition and structure of the merger remnant as well as the resulting emissions. This image depicts the density of neutrinos within the remnant as varying textures, and the colors represent energy densities of different neutrino flavors. Credit: Provided by the Radice research group / Penn State. Creative Commons
＜関連情報＞
- https://www.psu.edu/news/eberly-college-science/story/mixing-neutrinos-colliding-neutron-stars-changes-how-merger-unfolds
- https://journals.aps.org/prl/abstract/10.1103/h2q7-kn3v
中性子星合体におけるニュートリノフレーバー変換 Neutrino Flavor Transformation in Neutron Star Mergers
Yi Qiu, David Radice, Sherwood Richers, and Maitraya Bhattacharyya
Physical Review Letters Published: 26 August, 2025
DOI: https://doi.org/10.1103/h2q7-kn3v
Abstract
We present the first numerical relativity simulations including neutrino flavor transformations that could result from flavor instabilities, quantum many-body effects, or potential beyond standard model physics in neutron star mergers. We find that neutrino flavor transformations impact the composition and structure of the remnant, potentially leaving an imprint on the postmerger gravitational-wave signal. They also have a significant impact on the composition and nucleosynthesis yields of the ejecta.
