2026-10-29 東京大学
連星ブラックホールの合体に伴う重力波とその特徴的な振動の起源を明らかにした本研究の概念図
＜関連情報＞
- https://www.u-tokyo.ac.jp/focus/ja/press/z0208_00241.html
- https://journals.aps.org/prd/abstract/10.1103/29n2-dsmr
代数的に特別な周波数付近のカー準正規モードにおける極スキップ、交差回避、および共鳴励起 Pole skipping, avoided crossing, and resonant excitation in Kerr quasinormal modes near algebraically special frequencies
Kei-ichiro Kubota and Hayato Motohashi
Physical Review D Published: 28 October, 2026
DOI:https://doi.org/10.1103/29n2-dsmr
Abstract
Kerr quasinormal modes near algebraically special frequencies exhibit anomalous behavior, including apparent bifurcation, disappearance, and a nonsmooth connection to the Schwarzschild limit, which has remained puzzling for decades. Tracking poles and zeros of Green-function building blocks across different Riemann sheets, we show that the bifurcation is due to an avoided crossing accompanied by resonant excitation, while the disappearance is due to pole skipping caused by cancellation of a quasinormal-mode pole by a Matsubara-mode zero. This resolves the physical origin of these long-standing anomalies.
