334 citations · 4k across the 75 of their papers we have counts for
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Exact solution for rotating black holes in parity-violating gravity
Hiroaki W. H. Tahara, Kazufumi Takahashi, Masato Minamitsuji +1
It has recently been pointed out that one can construct invertible conformal transformations with a parity-violating conformal factor, which can be employed to generate a novel cla…
Iterative extraction of overtones from black hole ringdown
Kazuto Takahashi, Hayato Motohashi
Extraction of multiple quasinormal modes from ringdown gravitational waves emitted from a binary black hole coalescence is a touchstone to test whether a remnant black hole is desc…
Black hole ringdown from physically sensible initial value problem in higher-order scalar-tensor theories
Keisuke Nakashi, Masashi Kimura, Hayato Motohashi +1
We study odd-parity perturbations about static and spherically symmetric black hole solutions with a linearly time-dependent scalar field in higher-order scalar-tensor theories. In…
Effective description of generalized disformal theories
Kazufumi Takahashi, Masato Minamitsuji, Hayato Motohashi
Generalized disformal transformations enable us to construct the generalized disformal Horndeski theories, which form the most general class of ghost-free scalar-tensor theories to…