Hayato Motohashi

Primordial black holes and local non-Gaussianity in canonical inflation

Primordial black holes and slow-roll violation

Generalized slow roll in the unified effective field theory of inflation

Fundamental theorem on gauge fixing at the action level

Disformal invariance of curvature perturbation

Third order equations of motion and the Ostrogradsky instability

Consistency relation for<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>R</mml:mi><mml:mi>p</mml:mi></mml:msup></mml:math>inflation

Black hole perturbation in the most general scalar-tensor theory with second-order field equations. II. The even-parity sector

Constraint on reheating after<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>f</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mi>R</mml:mi><mml:mo stretchy="false">)</mml:mo></mml:math>inflation from gravitational waves

Stability of cosmological solutions in extended quasidilaton massive gravity