6 papers
Scalar-scalar-tensor interaction in DHOST theories
S. Mironov, V. Volkova
We derive the general cubic action for perturbations about a cosmological background in the quadratic subclass of degenerate higher-order scalar-tensor (DHOST) theories, focusing o…
Ghost-free, gauge invariant SVT generalizations of Horndeski theory
S. Mironov, A. Shtennikova, M. Valencia-Villegas
We analyze the generalizations of Kaluza--Klein compactifications of 5D Horndeski theory. They are Scalar--Vector--Tensor (SVT) theories with higher derivatives in the action, but…
Luminal Scalar-Tensor theories for a not so dark Dark Energy
S. Mironov, A. Shtennikova, M. Valencia-Villegas
In general the speed of Gravitational Waves (GWs) in Scalar-Tensor modifications of Einstein's gravity is different from the speed of Light. Nevertheless, it has been measured that…
No-Go theorem in the cubic subclass of Horndeski theory for spherically symmetric dynamical background
S. Mironov, M. Sharov
We consider a general dynamical, spherically symmetric background in the cubic subclass of Horndeski theory and obtain the quadratic action for the perturbations using the DPSV app…
Higher derivative SVT theories from Kaluza-Klein reductions of Horndeski theory
S. Mironov, A. Shtennikova, M. Valencia-Villegas
It was recently pointed out that some precise Photon-Galileon couplings in four dimensions (4D) -- inspired by a higher dimensional reduction -- are enough to obtain a Horndeski th…
Reviving Horndeski after GW170817 by Kaluza-Klein compactifications
S. Mironov, A. Shtennikova, M. Valencia-Villegas
The application of Horndeski theory/ Galileons for late time cosmology is heavily constrained by the strict coincidence in the speed of propagation of gravitational and electromagn…