334 citations · 4k across the 75 of their papers we have counts for
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Black hole perturbation in nondynamical and dynamical Chern-Simons gravity
Hayato Motohashi, Teruaki Suyama
Chern-Simons gravitational theories are extensions of general relativity in which the parity is violated due to the Chern-Simons term. We study linear perturbations on the static a…
Black hole perturbation in parity violating gravitational theories
Hayato Motohashi, Teruaki Suyama
We study linear perturbations around the static and spherically symmetric spacetime for the gravitational theories whose Lagrangian depends on Ricci scalar and the parity violating…
f(R) Gravity and its Cosmological Implications
Hayato Motohashi, Alexei A. Starobinsky, Jun'ichi Yokoyama
We have investigated the evolution of a homogeneous isotropic background of the Universe and inhomogeneous subhorizon matter density perturbations in viable models of presen…
Future Oscillations around Phantom Divide in f(R) Gravity
Hayato Motohashi, Alexei A. Starobinsky, Jun'ichi Yokoyama
It is known that scalar-tensor theory of gravity admits regular crossing of the phantom divide line $w_{\DE}=-1$ for dark energy, and existing viable models of present dark energy…