Norichika Sago | Last modified date：2017.05.30 |

Assistant Professor /
Division for Arts and Science

Division for Theoretical Natural Science

Faculty of Arts and Science

Division for Theoretical Natural Science

Faculty of Arts and Science

Academic Degree

Ph.D. (Science)

Field of Specialization

Gravitational wave physics

Research

**Research Interests**

- Research on gravitational wave sources using black hole perturbation theory

keyword : Gravitational wave, Black hole perturbation, Gravitational self-force

2012.04.

**Academic Activities**

**Papers**

1. | Norichika Sago, Ryuichi Fujita, Hiroyuki Nakano, Accuracy of the Post-Newtonian Approximation for Extreme-Mass Ratio Inspirals from Black-hole Perturbation Approach, arXiv:1601.02174. |

2. | Norichika Sago, Ryuichi Fujita, Calculation of radiation reaction effect on orbital parameters in Kerr spacetime, Progress of Theoretical and Experimental Physics, 2015, arXiv:1505.01600, 2015.07. |

3. | Soichiro Isoyama, Hiroyuki Nakano, Ryuichi Fujita, Sago Norichika, Takahiro Tanaka, Evolution of the Carter constant for a resonant inspiral into a Kerr black hole: I. The scalar case, Progress of Theoretical and Experimental Physics, 2013, 6, arXiv:1302.4035 [gr-qc], 2013.06. |

4. | Soichiro Isoyama, Ryuichi Fujita, Norichika Sago, Hideyuki Tagoshi, Takahiro Tanaka, Impact of the second order self-forces on the dephasing of the gravitational waves from quasi-circular extreme mass-ratio inspirals, Physical Review D, 87, 2, 024010, 2013.01. |

5. | Sarp Akcay, Leor Barack, Thibault Damour, Norichika Sago , Gravitational self-force and the effective-one-body formalism between the innermost stable circular orbit and the light ring, Physical Review D, 86, 104041, 2012.11. |

**Presentations**

1. | 佐合 紀親, Gravitational waves from a spinning particle orbiting a Kerr black hole, Compact stars and gravitational waves, 2016.11.01. |

2. | 佐合 紀親, Gravitational waves from a spinning particle in Kerr spacetime, Spanish-Portuguese Relativity Meeting, 2016.09.13. |

3. | 佐合 紀親, Calculation of radiation reaction effect on orbital parameters in Kerr spacetime, 18th Capra Meeting on Radiation Reaction in General Relativity, 2015.07.01. |

**Membership in Academic Society**

- The Physics Education Society of Japan
- The Physical Society of Japan

Educational

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