Research field (1)：
Theoretical studies related to particle-, nuclear-, cosmic ray and astro-physics
Research theme for competitive and other funds (4)：
2021 - 2026 Construction of gravitational wave templates for precise observation of black holes in galactic nuclei
2016 - 2020 Orbital evolution of a spinning particle in black hole spacetime
2013 - 2016 Study of relativistic binaries by black hole perturbation approach
2010 - 2013 ブラックホール摂動法による重力波源の研究
Papers (53)：
Nami Uchikata, Tatsuya Narikawa, Hiroyuki Nakano, Norichika Sago, Hideyuki Tagoshi, Takahiro Tanaka. Searching for gravitational wave echoes from black hole binary events in the third observing run of LIGO, Virgo, and KAGRA collaborations. Physical Review D. 2023. 108. 10
Norichika Sago, Takahiro Tanaka. Efficient search method of anomalous reflection by the central object in an extreme mass-ratio inspiral system by future space gravitational wave detectors. Physical Review D. 2022. 106. 2
Soichiro Isoyama, Ryuichi Fujita, Alvin J. K. Chua, Hiroyuki Nakano, Adam Pound, Norichika Sago. Adiabatic Waveforms from Extreme-Mass-Ratio Inspirals: An Analytical Approach. Physical Review Letters. 2022. 128. 23
Norichika Sago, Soichiro Isoyama, Hiroyuki Nakano. Fundamental Tone and Overtones of Quasinormal Modes in Ringdown Gravitational Waves: A Detailed Study in Black Hole Perturbation. Universe. 2021. 7. 10. 357-357
Norichika Sago, Takahiro Tanaka. Oscillations in the extreme mass-ratio inspiral gravitational wave phase correction as a probe of a reflective boundary of the central black hole. Physical Review D. 2021. 104. 6
