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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…
Ultralight scalars and resonances in black-hole physics
Ryuichi Fujita, Vitor Cardoso
Ultralight degrees of freedom coupled to matter lead to resonances, which can be excited when the Compton wavelength of the field equals a dynamical scale in the problem. For binar…
Accuracy of the Post-Newtonian Approximation for Extreme-Mass Ratio Inspirals from Black-hole Perturbation Approach
Norichika Sago, Ryuichi Fujita, Hiroyuki Nakano
We revisit the accuracy of the post-Newtonian (PN) approximation and its region of validity for quasi-circular orbits of a point particle in the Kerr spacetime, by using an analyti…