1.3k citations · 18k across the 232 of their papers we have counts for
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Cosmic Acceleration and Growth of Structure in Massive Gravity
Michael Kenna-Allison, A. Emir Gumrukcuoglu, Kazuya Koyama
We introduce a cosmological model in the framework of Generalised Massive Gravity. This theory is an extension of non-linear massive gravity with a broken translation symmetry in t…
Testing Brans-Dicke Gravity with Screening by Scalar Gravitational Wave Memory
Kazuya Koyama
The Brans-Dicke theory of gravity is one of the oldest ideas to extend general relativity by introducing a non-minimal coupling between the scalar field and gravity. The Solar Syst…
Massive gravity with non-minimal coupling
A. Emir Gumrukcuoglu, Rampei Kimura, Kazuya Koyama
We propose new massive gravity theories with 5 dynamical degrees of freedom. We evade uniqueness theorems regarding the form of the kinetic and potential terms by adopting the "gen…
Prospects for Fundamental Physics with LISA
Enrico Barausse, Emanuele Berti, Thomas Hertog +318
In this paper, which is of programmatic rather than quantitative nature, we aim to further delineate and sharpen the future potential of the LISA mission in the area of fundamental…
Relativistic stars in a cubic Galileon Universe
Hiromu Ogawa, Tsutomu Kobayashi, Kazuya Koyama
We study relativistic stars in Hordenski theories that evade the gravitational wave constraints and exhibit the Vainshtein mechanism, focusing on a model based on the cubic Galileo…
Tracker and scaling solutions in DHOST theories
Noemi Frusciante, Ryotaro Kase, Kazuya Koyama +2
In quadratic-order degenerate higher-order scalar-tensor (DHOST) theories compatible with gravitational-wave constraints, we derive the most general Lagrangian allowing for tracker…