178 citations · 798 across the 21 of their papers we have counts for
21 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…
Symplectic mechanics of relativistic spinning compact bodies. III. quadratic-in-spin integrability in Type-D Einstein spacetimes: persistence and breakdown
Paul Ramond, Soichiro Isoyama, Adrien Druart
We investigate the integrability of spinning compact body dynamics at quadratic order in spin in four-dimensional Einstein spacetimes admitting a non-degenerate Killing--Yano tenso…
The Fast and the Frame-Dragging: Efficient waveforms for asymmetric-mass eccentric equatorial inspirals into rapidly-spinning black holes
Christian E. A. Chapman-Bird, Lorenzo Speri, Zachary Nasipak +13
Observations of gravitational-wave signals emitted by compact binary inspirals provide unique insights into their properties, but their analysis requires accurate and efficient wav…
Symplectic mechanics of relativistic spinning compact bodies II.: Canonical formalism in the Schwarzschild spacetime
Paul Ramond, Soichiro Isoyama
This work constitutes the second part of a series of studies that aim to utilise tools from Hamiltonian mechanics to investigate the motion of an extended body in general relativit…
Waveform Modelling for the Laser Interferometer Space Antenna
LISA Consortium Waveform Working Group, Niayesh Afshordi, Sarp Akçay +144
LISA, the Laser Interferometer Space Antenna, will usher in a new era in gravitational-wave astronomy. As the first anticipated space-based gravitational-wave detector, it will exp…
Symplectic mechanics of relativistic spinning compact bodies. I. linear-in-spin integrability under Killing-Yano symmetry
Paul Ramond, Soichiro Isoyama
We study the Hamiltonian dynamics of a neutral, massive spinning test body at linear order in spin, as governed by the Mathisson--Papapetrou--Tulczyjew--Dixon equations in a 4-dime…
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…
Fundamental Tone and Overtones of Quasinormal Modes in Ringdown Gravitational Waves: A Detailed Study in Black Hole Perturbation
Norichika Sago, Soichiro Isoyama, Hiroyuki Nakano
Ringdown gravitational waves of compact object binaries observed by ground-based gravitational-wave detectors encapsulate rich information to understand remnant objects after the m…
Scope out multiband gravitational-wave observations of GW190521-like binary black holes with space gravitational wave antenna B-DECIGO
Hiroyuki Nakano, Ryuichi Fujita, Soichiro Isoyama +1
The gravitational wave event, GW190521 is the most massive binary black hole merger observed by ground-based gravitational wave observatories LIGO/Virgo to date. While the observed…
Post-Newtonian templates for gravitational waves from compact binary inspirals
Soichiro Isoyama, Riccardo Sturani, Hiroyuki Nakano
To enable detection and maximise the physics output of gravitational wave observations from compact binary systems, it is crucial the availability of accurate waveform models. The…
Self-force effects on the marginally bound zoom-whirl orbit in Schwarzschild spacetime
Leor Barack, Marta Colleoni, Thibault Damour +2
For a Schwarzchild black hole of mass , we consider a test particle falling from rest at infinity and becoming trapped, at late time, on the unstable circular orbit of radius $r…
"Flux-balance formulae" for extreme mass-ratio inspirals
Soichiro Isoyama, Ryuichi Fujita, Hiroyuki Nakano +2
The "flux-balance formulae" that determine the averaged evolution of energy, azimuthal angular momentum, and Carter constant in terms of the averaged asymptotic gravitational-wave…
Multiband Gravitational-Wave Astronomy: Observing binary inspirals with a decihertz detector, B-DECIGO
Soichiro Isoyama, Hiroyuki Nakano, Takashi Nakamura
An evolving Japanese gravitational-wave (GW) mission in the deci-Hz band: B-DECIGO (DECihertz laser Interferometer Gravitational wave Observatory) will enable us to detect GW150914…
Post-Newtonian templates for binary black-hole inspirals: the effect of the horizon fluxes and the secular change in the black-hole masses and spins
Soichiro Isoyama, Hiroyuki Nakano
Black holes (BHs) in an inspiraling compact binary system absorb the gravitational-wave (GW) energy and angular-momentum fluxes across their event horizons and this leads to the se…
Hamiltonian Formulation of the Conservative Self-Force Dynamics in the Kerr Geometry
Ryuichi Fujita, Soichiro Isoyama, Alexandre Le Tiec +3
We formulate a Hamiltonian description of the orbital motion of a point particle in Kerr spacetime for generic (eccentric, inclined) orbits, which accounts for the effects of the c…
Self-force and fluid resonances
Soichiro Isoyama, Raissa F. P. Mendes, Eric Poisson
The gravitational self-force acting on a particle orbiting a massive central body has thus far been computed for vacuum spacetimes involving a black hole. In this work we continue…
Gravitational Self-Force Correction to the Innermost Stable Circular Equatorial Orbit of a Kerr Black Hole
Soichiro Isoyama, Leor Barack, Sam R. Dolan +5
For a self-gravitating particle of mass μin orbit around a Kerr black hole of mass M >> μ, we compute the O(μ/M) shift in the frequency of the innermost stable circular equatorial…
Evolution of the Carter constant for a resonant inspiral into a Kerr black hole: I. The scalar case
Soichiro Isoyama, Ryuichi Fujita, Hiroyuki Nakano +2
We discuss the inspiral of a small body around a Kerr black hole. When the time scale of the radiation reaction is sufficiently longer than its orbital period, the leading order or…
Impact of the second order self-forces on the dephasing of the gravitational waves from quasi-circular extreme mass-ratio inspirals
Soichiro Isoyama, Ryuichi Fujita, Norichika Sago +2
The accurate calculation of long-term phase evolution of gravitational wave (GW) forms from extreme (intermediate) mass ratio inspirals (E(I)MRIs) is an inevitable step to extract…
Self-force as probe of internal structure
Soichiro Isoyama, Eric Poisson
The self-force acting on a (scalar or electric) charge held in place outside a massive body contains information about the body's composition, and can therefore be used as a probe…
Cosmic censorship in overcharging a Reissner-Nordström black hole via charged particle absorption
Soichiro Isoyama, Norichika Sago, Takahiro Tanaka
There is a claim that a static charged black hole (Reissner-Nordström black hole) can be overcharged by absorbing a charged test particle. If it is true, it might give a counter ex…