20 citations · 32 across the 5 of their papers we have counts for
5 papers
Tidal response beyond vacuum General Relativity with a canonical definition
Takuya Katagiri, Vitor Cardoso, Tact Ikeda +1
Tidal effects on compact objects provide profound theoretical insights into the structure of the field equations, and are wonderful probes of the equation of state of matter, the n…
Vector-tensor theories in metric-affine geometry
Tact Ikeda
We investigate ghost-free vector-tensor theories in metric-affine geometry. In all of our analysis, we start with the Lagrangian containing up to quadratic terms of first-order der…
Parametrized Love numbers of non-rotating black holes
Takuya Katagiri, Tact Ikeda, Vitor Cardoso
A set of tidal Love numbers quantifies tidal deformation of compact objects and is a detectable imprint in gravitational waves from inspiralling binary systems. The measurement of…
Consistency of higher derivative couplings to matter fields in scalar-tensor gravity
Tact Ikeda, Kazufumi Takahashi, Tsutomu Kobayashi
Recently, a generalization of invertible disformal transformations containing higher-order derivatives of a scalar field has been proposed in the context of scalar-tensor theories…
Stars disformally coupled to a shift-symmetric scalar field
Tact Ikeda, Aya Iyonaga, Tsutomu Kobayashi
We investigate static and spherically symmetric stars disformally coupled to a scalar field. The scalar field is assumed to be shift symmetric, and hence the conformal and disforma…