535 citations · 3.9k across the 55 of their papers we have counts for
56 papers
Secular evolution of orbital parameters for general bound orbits in Kerr spacetime
Norichika Sago, Ryuichi Fujita, Soichiro Isoyama +1
We analytically derive the secular changes of the orbital parameters, i.e., energy, angular momentum, and Carter constant, for general bound orbits in Kerr spacetime, at leading or…
Gravitational Wave Memory from Accelerating Relativistic Jets in Multiple Thick Shell Scenarios
Yusuke Sakai, Ryo Yamazaki, Yoshihiro Okutani +4
Gravitational wave (GW) memory, a permanent distortion of the space-time metric, is anticipated during the acceleration of relativistic jets in gamma-ray bursts (GRBs). While the p…
Post-Newtonian templates for phase evolution of spherical extreme mass ratio inspirals
Norichika Sago, Ryuichi Fujita, Hiroyuki Nakano
We present various post-Newtonian (PN) models for the phase evolution of compact objects moving along quasi-spherical orbits in Kerr spacetime derived by using the 12PN analytic fo…
Searching for gravitational wave echoes from black hole binary events in the third observing run of LIGO, Virgo, and KAGRA collaborations
Nami Uchikata, Tatsuya Narikawa, Hiroyuki Nakano +3
Gravitational wave echo signals have been proposed as evidence for the modification of the spacetime structure near the classical event horizon. These signals are expected to occur…
Efficient search method of anomalous reflection by the central object in an EMRI system by future space gravitational wave detectors
Norichika Sago, Takahiro Tanaka
In our previous work we investigated the effect of the hypothetical reflecting boundary near the black hole event horizon on the waveform from extreme mass-ratio inspirals (EMRIs).…
Adiabatic waveforms from extreme-mass-ratio inspirals: an analytical approach
Soichiro Isoyama, Ryuichi Fujita, Alvin J. K. Chua +3
Scientific analysis for the gravitational-wave detector LISA will require theoretical waveforms from extreme-mass-ratio inspirals (EMRIs) that extensively cover all possible orbita…