Zobrazeno 1 - 10
of 63
pro vyhledávání: '"Alexey 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
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:
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
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
Publikováno v:
Symmetry, Vol 12, Iss 6, p 917 (2020)
In this paper, we investigate a nonlocal modification of general relativity (GR) with action S = 1 16 π G ∫ [ R − 2 Λ + ( R − 4 Λ ) F ( □ ) ( R − 4 Λ ) ] − g d 4 x , where F ( □ ) = ∑ n = 1 + ∞ f n □ n is an analytic function
Externí odkaz:
https://doaj.org/article/43078e8af8364202ac05811cab9a7a86
Autor:
Alexey S. Koshelev, Anna Tokareva
Publikováno v:
Physical Review
In this work we explicitly show that the perturbative unitarity of analytic infinite derivative (AID) scalar field theories can be achieved using a modified prescription for computing scattering amplitudes. The crux of the new prescription is the ana
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::896616bb7a9527e343135b965d06b165
http://repo.scoap3.org/api
http://repo.scoap3.org/api
Publikováno v:
International Journal of Modern Physics D. 29(14)
Emergence of $R^2$ inflation which is the best fit framework for CMB observations till date comes from the attempts to attack the problem of quantization of gravity which in turn have resulted in the trace anomaly discovery. Further developments in t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::74ee5b76cfa666bd1dd91f3ce24e498d
https://hdl.handle.net/11370/7b277944-ccae-4985-9aff-6d3ba76ceef5
https://hdl.handle.net/11370/7b277944-ccae-4985-9aff-6d3ba76ceef5