413 citations · 582 across the 8 of their papers we have counts for
8 papers
Generating cosmological perturbations in non-singular Horndeski cosmologies
Y. Ageeva, P. Petrov, V. Rubakov
We construct a concrete model of Horndeski bounce with strong gravity in the past. Within this model we show that the correct spectra of cosmological perturbations may be generated…
On the strong coupling problem in cosmologies with "strong gravity in the past"
Y. Ageeva, P. Petrov
We examine the potential strong coupling problem at early times in a bouncing cosmological model with "strong gravity in the past" (Jordan frame), which is conformally related to i…
Nonsingular cosmological models with strong gravity in the past
Y. Ageeva, P. Petrov, V. Rubakov
In scalar-tensor Horndeski theories, nonsingular cosmological models - bounce and genesis - are problematic because of potential ghost and/or gradient instabilities. One way to get…
Horndeski genesis: consistency of classical theory
Y. Ageeva, P. Petrov, V. Rubakov
Genesis within the Horndeski theory is one of possible scenarios for the start of the Universe. In this model, the absence of instabilities is obtained at the expense of the proper…
Power-law Genesis: strong coupling and galileon-like vector fields
P. K. Petrov
A simple way to construct models with early cosmological Genesis epoch is to employ bosonic fields whose Lagrangians transform homogeneously under scaling transformation. We show t…
Galileon-like vector fields
Pavel Petrov
We construct simple Lagrangians of vector fields which involve second derivatives, but nevertheless lead to second order field equations. These vector fields are, therefore, analog…