40 citations · 133 across the 10 of their papers we have counts for
9 papers
The primordial non-Gaussianities for non-singular Horndeski cosmologies
Y. Ageeva, M. Kotenko, P. Petrov
We consider a novel Bounce Universe model constructed within the framework of Horndeski gravity. We have analyzed the bispectrum of primordial scalar perturbations and evaluated th…
Non-renormalizable theories and finite formulation of QFT
Y. Ageeva, P. Petrov, M. Shaposhnikov
In this paper, we show how the finite formulation of QFT based on Callan-Symanzik equations can be generalised to the case of non-renormalizable theories. We derive an equation for…
K-inflation: the legitimacy of classical treatment
Y. Ageeva, P. Petrov
In this paper we consider a general theory of k-inlation and find out, that it may be in strong coupling regime. We derive accurate conditions of classical description validity usi…
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…
Toward evading the strong coupling problem in Horndeski genesis
Y. Ageeva, O. Evseev, O. Melichev +1
It is of interest to understand whether or not one can construct a classical field theory description of early cosmology which would be free of the initial singularity and stable t…
Horndeski Genesis: strong coupling and absence thereof
Y. A. Ageeva, O. A. Evseev, O. I. Melichev +1
We consider Genesis in the Horndeski theory as an alternative to or completion of the inflationary scenario. One of the options free of instabilities at all cosmological epochs is…