Zobrazeno 1 - 10
of 166
pro vyhledávání: '"Valery Rubakov"'
Publikováno v:
Journal of High Energy Physics, Vol 2023, Iss 1, Pp 1-46 (2023)
Abstract 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 at early contracting epoch, with mild fine-tuning ensuring t
Externí odkaz:
https://doaj.org/article/051b9fa56a8441ef9fd357de8f0d4e9d
Publikováno v:
Journal of High Energy Physics, Vol 2020, Iss 12, Pp 1-24 (2020)
Abstract 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 property that coefficients, serving as effective Planck masses, van
Externí odkaz:
https://doaj.org/article/9d3c354541d34fd3a5ca8ba2a4c05925
Autor:
Valery Rubakov
Based on a highly regarded lecture course at Moscow State University, this is a clear and systematic introduction to gauge field theory. It is unique in providing the means to master gauge field theory prior to the advanced study of quantum mechanics
Publikováno v:
Journal of Experimental and Theoretical Physics. 129:553-565
This essay is a brief review of the recent studies of non-singular cosmological scenarios with bounce and Genesis and their stability in a subclass of scalar–tensor theories with higher derivatives—beyond Horndeski theories. We discuss the genera
Publikováno v:
Physical Review
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 around this obstacle is to send the effective Planck mass to zero in
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d9ee5c677b18799512c27e4d1f50d12a
http://arxiv.org/abs/2104.13412
http://arxiv.org/abs/2104.13412
Publikováno v:
Journal of High Energy Physics
Journal of High Energy Physics, Vol 2021, Iss 4, Pp 1-13 (2021)
Journal of High Energy Physics, Vol 2021, Iss 4, Pp 1-13 (2021)
We consider DHOST Ia theory interacting gravitationally with an additional conventional scalar field minimally coupled to gravity. At the linearized level of perturbations about cosmological background, we find that in the presence of a slowly rollin
Publikováno v:
Journal of High Energy Physics, Vol 2020, Iss 12, Pp 1-24 (2020)
Journal of High Energy Physics
Journal of High Energy Physics
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 property that coefficients, serving as effective Planck masses, vanish in th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::85abdd24001264902eaa4dfcc8a15c91
Publikováno v:
Physical Review
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 throughout the whole evolution. One of the known possibilities is genes
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::78fe3415e9ad805135582de4ce1fdf57
We address the issue of potential superluminal propagation of gravitational waves in backgrounds neighboring the previously suggested bounce [arXiv:1807.08361] in beyond Horndeski theory. We find that the bouncing solution lies right at the boundary
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::999502c7fa1fe8d6dcd3c8728c1820a9