4 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…