Isao Okamoto
Isao Okamoto is astorophysicist, working about black holes.
References
https://www.researchgate.net/profile/Isao_Okamoto/publication/234233341_Is_the_nutation_of_the_solid_inner_core_responsible_for_the_24-year_libration_of_the_pole/links/5406f6940cf2bba34c1e7de9.pdf Kakuta, C.; Okamoto, I.; Sasao, T. Is the nutation of the solid inner core responsible for the 24-year libration of the pole? Astronomical Society of Japan, Publications, vol. 27, no. 2, 1975, p. 357-365.
https://www.researchgate.net/profile/Isao_Okamoto/publication/1973747_Thermodynamics_of_a_black_hole_in_a_cavity/links/0912f51072add8897f000000.pdf Renaud Parentani, Joseph Katz and Isao Okamoto. Thermodynamics of a black hole in a cavity. Classical and Quantum Gravity, Volume 12, Number 7.
http://iopscience.iop.org/article/10.1086/305479/fulltext/ KOUICHI HIROTANI, ISAO OKAMOTO. Pair Plasma Production in a Force-free Magnetosphere around a Supermassive Black Hole. THE ASTROPHYSICAL JOURNAL, 497:563–572, 1998 April 20.
https://www.researchgate.net/publication/229574284_Peculiar_Black-Hole_Unipolar_Induction_Fig_1 Isao Okamoto. Peculiar Black-Hole Unipolar Induction. Astronomical Society of Japan 64(2012):50 · June 2012.
https://www.researchgate.net/publication/277608491_Black_Hole_Electrodynamics_How_Does_Unipolar_Induction_Work_in_Kerr_Black_Holes Isao Okamoto. Black Hole Electrodynamics: How Does Unipolar Induction Work in Kerr Black Holes ? Article in Publications- Astronomical Society of Japan 67(5) · May 2015
https://www.researchgate.net/publication/299426207_Frame_Dragging_Unipolar_Induction_and_Jet_Source. Isao Okamoto. Frame Dragging, Unipolar Induction and Jet Source. · December 2015.