219 citations · 2.3k across the 55 of their papers we have counts for
11 papers · 1 filter
Constraints on massive vector dark energy models from integrated Sachs-Wolfe-galaxy cross-correlations
Shintaro Nakamura, Antonio De Felice, Ryotaro Kase +1
The gravitational-wave event GW170817, together with the electromagnetic counterpart, shows that the speed of tensor perturbations on the cosmological background is very clos…
Most general cubic-order Horndeski Lagrangian allowing for scaling solutions and the application to dark energy
Noemi Frusciante, Ryotaro Kase, Nelson J. Nunes +1
In cubic-order Horndeski theories where a scalar field is coupled to nonrelativistic matter with a field-dependent coupling , we derive the most general Lagrangian having…
Dark energy in Horndeski theories after GW170817: A review
Ryotaro Kase, Shinji Tsujikawa
The gravitational-wave event GW170817 from a binary neutron star merger together with the electromagnetic counterpart showed that the speed of gravitational waves is very clo…
Gauge-ready formulation of cosmological perturbations in scalar-vector-tensor theories
Lavinia Heisenberg, Ryotaro Kase, Shinji Tsujikawa
In scalar-vector-tensor (SVT) theories with parity invariance, we perform a gauge-ready formulation of cosmological perturbations on the flat Friedmann-Lemaître-Robertson-Walker (F…
Dark energy in scalar-vector-tensor theories
Ryotaro Kase, Shinji Tsujikawa
The scalar-vector-tensor theories with second-order equations of motion can accommodate both Horndeski and generalized Proca theories as specific cases. In the presence of a perfec…
Cosmology in scalar-vector-tensor theories
Lavinia Heisenberg, Ryotaro Kase, Shinji Tsujikawa
We study the cosmology on the Friedmann-Lemaitre-Robertson-Walker background in scalar-vector-tensor theories with a broken gauge symmetry. For parity-invariant interactions…