90 citations · 140 across the 3 of their papers we have counts for
7 papers
Minimally Modified Gravity fitting Planck data better than CDM
Katsuki Aoki, Antonio De Felice, Shinji Mukohyama +3
We study the phenomenology of a class of minimally modified gravity theories called theories, in which the usual general relativistic Hamiltonian constraint is rep…
Consistent inflationary cosmology from quadratic gravity with dynamical torsion
Katsuki Aoki, Shinji Mukohyama
The idea of gauge theories of gravity predicts that there should exist not only the massless graviton but also massive particles carrying the gravitational force. We study the cosm…
Ghostfree quadratic curvature theories with massive spin-2 and spin-0 particles
Katsuki Aoki, Shinji Mukohyama
We consider generic derivative corrections to the Einstein gravity and find new classes of theories without ghost around the Minkowski background by means of an extension of the sp…
Scalar-metric-affine theories: Can we get ghost-free theories from symmetry?
Katsuki Aoki, Keigo Shimada
We reveal the existence of a certain hidden symmetry in general ghost-free scalar-tensor theories which can only be seen when generalizing the geometry of the spacetime from Rieman…
Metric-affine Gravity and Inflation
Keigo Shimada, Katsuki Aoki, Kei-ichi Maeda
We classify the metric-affine theories of gravitation, in which the metric and the connections are treated as independent variables, by use of several constraints on the connection…
Massive graviton dark matter with environment dependent mass: A natural explanation of the dark matter-baryon ratio
Katsuki Aoki, Shinji Mukohyama
We propose a scenario that can naturally explain the observed dark matter-baryon ratio in the context of bimetric theory with a chameleon field. We introduce two additional gravita…