84 citations · 266 across the 7 of their papers we have counts for
4 papers · 1 filter
Perturbations in generalized Galileon theories
R. Kolevatov, S. Mironov, V. Rubakov +2
We discuss the approaches by Deffayet et al. (DPSV) and Kobayashi et al. (KYY) to the analysis of linearized scalar perturbations about a spatially flat FLRW background in Horndesk…
Cosmological bounce and Genesis beyond Horndeski
R. Kolevatov, S. Mironov, N. Sukhov +1
We study a "classical" bouncing scenario in beyond Horndeski theory. We give an example of spatially flat bouncing solution that is non-singular and stable throughout the whole evo…
Cosmological bounces and Lorentzian wormholes in Galileon theories with an extra scalar field
R. Kolevatov, S. Mironov
We study whether it is possible to design a "classical" spatially flat bouncing cosmology or a static, spherically symmetric asymptotically flat Lorentzian wormhole in cubic Galile…
Superluminality in dilatationally invariant generalized Galileon theories
Roman Kolevatov
We consider small perturbations about homogeneous backgrounds in dilatationally-invariant Galileon models. The issues we address are stability (absence of ghosts and gradient insta…