Zobrazeno 1 - 10
of 155
pro vyhledávání: '"A S, Koshelev"'
Publikováno v:
Journal of High Energy Physics, Vol 2023, Iss 7, Pp 1-37 (2023)
Abstract The R 2 inflation which is an extension of general relativity (GR) by quadratic scalar curvature introduces a quasi-de Sitter expansion of the early Universe governed by Ricci scalar being an eigenmode of d’Alembertian operator. In this pa
Externí odkaz:
https://doaj.org/article/af1a01b0534a4209b1dd07ebc4926f89
Publikováno v:
Journal of High Energy Physics, Vol 2023, Iss 7, Pp 1-31 (2023)
Abstract In [1], a most general higher curvature non-local gravity action was derived that admits a particular R 2-like inflationary solution predicting the spectral index of primordial scalar perturbations n s N ≈ 1 − 1 2 $$ {n}_s(N)\approx 1-\f
Externí odkaz:
https://doaj.org/article/efa6710db08b4923b34b479dbe745a46
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 82, Iss 12, Pp 1-10 (2022)
Abstract We entertain the possibility that dark energy arises from the Higgs field of quintessence type in the non-perturbative regimes. For this purpose we utilize a set of exact solutions of Higgs field theory recently devised, in terms of Jacobi e
Externí odkaz:
https://doaj.org/article/ecbc9ca92ef34abcb50f9a516a7ceb66
Autor:
Andrey V. Puchkov, Elena V. Berezina, Evgeny Yu. Yakovlev, Nicholas R. Hasson, Sergey V. Druzhinin, Alexey S. Tyshov, Ekaterina V. Ushakova, Lev S. Koshelev, Pavel I. Lapikov
Publikováno v:
Geography, Environment, Sustainability, Vol 15, Iss 3, Pp 5-18 (2022)
This paper describes a five-month experiment (February – July 2021) measuring the gradual thaw diffusion of radon-222 (further in the article – radon) from a frozen environment in NW Russia (i.e. Arhangelsk region). Red clay substrate containting
Externí odkaz:
https://doaj.org/article/7a03665a94ab4a2d8d882323772c25c6
Publikováno v:
Physics Letters B, Vol 841, Iss , Pp 137924- (2023)
We show a theorem proving that a non-local bosonic field upon a covariant interaction with a confining gauge field undergoes the confinement of its degrees of freedom present in the free theory changing completely the physical mass spectrum following
Externí odkaz:
https://doaj.org/article/4afeaf7b662f438c8faf62126b1f87cf
Publikováno v:
Physics Letters B, Vol 838, Iss , Pp 137686- (2023)
Gravity can be embedded into a renormalizable theory by means of adding quadratic in curvature terms. However, this at first leads to the presence of the Weyl ghost. It is possible to get rid of this ghost if the locality assumption is weakened and t
Externí odkaz:
https://doaj.org/article/90551956674a41f584150a7899af1312
Publikováno v:
Medičnì Perspektivi, Vol 25, Iss 2, Pp 43-47 (2020)
In our time the study of the influence of soya and especially sunflower lecithin as one of the natural monopolies inUkraine, on the state of cognitive functions is relevant. Specified neurotropic activity of lecithin is characterized by the obstacle
Externí odkaz:
https://doaj.org/article/48fe1ca26f254626bbc748bb0a49cc3f
Publikováno v:
Journal of High Energy Physics, Vol 2020, Iss 6, Pp 1-40 (2020)
Abstract In this paper we will study R 2-like inflation in a non-local modification of gravity which contains quadratic in Ricci scalar and Weyl tensor terms with analytic infinite derivative form-factors in the action. It is known that the inflation
Externí odkaz:
https://doaj.org/article/91bb10dfd9f1497ab582133ae88b5ede
Autor:
I. F. Khramtsov, B. S. Koshelev
Publikováno v:
Зерновое хозяйство России, Vol 0, Iss 2, Pp 144-152 (2018)
The article deals with the primary directions of resource saving of grain production in Western Siberia which make it competitive on grain market studied by the departments of agriculture and economics of Siberian research Institute of Agriculture. T
Externí odkaz:
https://doaj.org/article/c4712a58bfdc4a8684fdf5e69ee85ba9
Publikováno v:
Journal of High Energy Physics, Vol 2018, Iss 3, Pp 1-37 (2018)
Abstract It is natural to expect a consistent inflationary model of the very early Universe to be an effective theory of quantum gravity, at least at energies much less than the Planck one. For the moment, R + R 2, or shortly R 2, inflation is the mo
Externí odkaz:
https://doaj.org/article/f2fa769cb4c145a8833324001ad9b7e3