84 citations · 180 across the 3 of their papers we have counts for
4 papers
Nearly scale-invariant curvature modes from entropy perturbations during graceful exit
Anna Ijjas, Roman Kolevatov
In this Letter, we describe how a spectrum of entropic perturbations generated during a period of slow contraction can source a nearly scale-invariant spectrum of curvature perturb…
Sourcing curvature modes with entropy perturbations in non-singular bouncing cosmologies
Anna Ijjas, Roman Kolevatov
The observed temperature fluctuations in the cosmic microwave background can be traced back to primordial curvature modes that are sourced by adiabatic and/or entropic matter pertu…
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…