4 papers
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…