96 citations · 1.2k across the 37 of their papers we have counts for
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Theories with limited extrinsic curvature and a nonsingular anisotropic universe
Yuki Sakakihara, Daisuke Yoshida, Kazufumi Takahashi +1
We propose a class of theories that can limit scalars constructed from the extrinsic curvature. Applied to cosmology, this framework allows us to control not only the Hubble parame…
General Relativity solutions with stealth scalar hair in quadratic higher-order scalar-tensor theories
Kazufumi Takahashi, Hayato Motohashi
We explore General Relativity solutions with stealth scalar hair in general quadratic higher-order scalar-tensor theories. Adopting the assumption that the scalar field has a const…
Extended Cuscuton as Dark Energy
Aya Iyonaga, Kazufumi Takahashi, Tsutomu Kobayashi
Late-time cosmology in the extended cuscuton theory is studied, in which gravity is modified while one still has no extra dynamical degrees of freedom other than two tensor modes.…