Research field (2)：
Theoretical studies related to particle-, nuclear-, cosmic ray and astro-physics
, Astronomy
Research keywords (6)：
Searching/Testing Theories of Gravity
, Massive Black Hole at Galactic Center
, statistical compatibility between theoretical prediction and observational data
, Quantum Effects about Black Holes
, Quantum Statistics of Gravity
, General Relativistic Statistical Mechanics
Research theme for competitive and other funds (9)：
2019 - 2024 Measurements of relativistic effects from supermassive black hole using Subaru telescope and near-infrared wavefront sensor
2019 - 2024 Testing General Relativity in the Strong Gravity of a Massive Black Hole
2015 - 2019 Study of precise radial velocity measurements of stars orbiting around a supermassive black hole, to investigate space-time structure around the black hole
2014 - 2018 Educational activities and its evaluation using the Galactic Center Supermassive Black Hole Sgr A * Events
2014 - 2018 Constraining the spin of Sgr A* via the motion of the S-stars
2014 - 2017 A Method for Direct Measurement of BH Spacetime
2010 - 2012 Test of Theory of General Relativity via Direct Imaging of Black Holes: Theoretical Prediction
2007 - 2009 Black Hole Evaporation and Black Hole Statistical Mechanics
2001 - 2002 膨張宇宙内のブラックホールの一意性定理,ホーキング輻射,熱力学
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Papers (29)：
Shogo Nishiyama, Tomohiro Kara, Brian Thorsbro, Hiromi Saida, Yohsuke Takamori, Masaaki Takahashi, Takayuki Ohgami, Kohei Ichikawa, Rainer Schödel. Origin of an orbiting star around the galactic supermassive black hole. Proceedings of the Japan Academy. Series B, Physical and biological sciences. 2024. 100. 1. 86-99
A. Hees, T. Do, B. M. Roberts, A. M. Ghez, S. Nishiyama, R. O. Bentley, A. K. Gautam, S. Jia, T. Kara, J. R. Lu, et al. Search for a Variation of the Fine Structure Constant around the Supermassive Black Hole in Our Galactic Center. Physical Review Letters. 2020. 124. 8
Shogo Nishiyama, Takayuki Ohgami, Yohsuke Takamori, Masaaki Takahashi, Hiromi Saida, Yosuke Minowa, Francisco Najarro, Satoshi Hamano, Masashi Omiya, Atsushi Iwamatsu, et al. A Significant Feature in the General Relativistic Time Evolution of the Redshift of Photons Coming from a Star Orbiting Sgr A*. Publication of the Astronomical Society of Japan. 2019. 71. 6
Tuan Do, Aurelien Hees, Andrea Ghez, Gregory D. Martinez, Devin S. Chu, Siyao Jia, Shoko Sakai, Jessica R. Lu, Abhimat K. Gautam, Kelly Kosmo O'Neil, et al. Relativistic redshift of the star S0-2 orbiting the Galactic center supermassive black hole. Science. 2019. 365. 6454. 664-668
Keisuke Nakashi, Shinpei Kobayashi, Shu Ueda, Hiromi Saida. Null geodesics and repulsive behavior of gravity in $(2+1)$D massive gravity. Progress of Theoretical and Experimental Physics. 2019. 2019. 7
Tomohiro Harada, Takahisa Igata, Hiromi Saida, Yohsuke Takamori. Periapsis shift of a quasi-circular orbit in a general static spherically symmetric spacetime. 2022
Takahisa Igata, Tomohiro Harada, Hiromi Saida, Yohsuke Takamori. Periapsis shifts in dark matter distribution around a black hole. 2022
斉田 浩見. What is the feature of underlying quantum gravity in the equation of states of Reissner-Nordström black hole ?. 大同大学紀要 = Bulletin of Daido University. 2013. 49. 61-70
Hiromi Saida. Nontriviality in Black Hole Thermodynamics: towards physically and mathematically rigorous foundation as phenomenology. 2013
Hiromi Saida. Limit of Universality of Entropy-Area Law for Multi-Horizon Spacetimes. 2011
