Zobrazeno 1 - 10
of 54
pro vyhledávání: '"Toporensky, Alexey V."'
Publikováno v:
JCAP 09 (2024) 050
We propose new slow-roll approximations for inflationary models with the Gauss-Bonnet term. We find more accurate expressions of the standard slow-roll parameters as functions of the scalar field. To check the accuracy of approximations considered we
Externí odkaz:
http://arxiv.org/abs/2403.06147
Publikováno v:
Int.J.Geom.Meth.Mod.Phys. 19 (2022) 10, 2250147
In this paper we generalize our previous results on spin connection for the linear scalar cosmological perturbation in $f(T)$ theory to wider class of theories which includes a scalar field $\Phi$ non-minimally coupled to torsion, and allows $\Phi$-d
Externí odkaz:
http://arxiv.org/abs/2110.12332
Publikováno v:
Eur. Phys. J. C 80 (2020) no. 11, 1054
We consider certain aspects of cosmological dynamics of a spatially curved Universe in $f(T)$ gravity. Local analysis allows us to find conditions for bounces and for static solutions; these conditions appear to be in general less restrictive than in
Externí odkaz:
http://arxiv.org/abs/2009.11410
Autor:
Pozdeeva, Ekaterina O., Gangopadhyay, Mayukh Raj, Sami, Mohammad, Toporensky, Alexey V., Vernov, Sergey Yu.
Publikováno v:
Phys. Rev. D 102, 043525 (2020)
We investigate inflationary dynamics in the framework of the Einstein-Gauss-Bonnet gravity. In the model under consideration, the inflaton field is non-minimally coupled to the Gauss-Bonnet curvature invariant, so that the latter appears to be dynami
Externí odkaz:
http://arxiv.org/abs/2006.08027
Publikováno v:
Eur. Phys. J. C 79 (2019) no. 10, 813
We consider the cosmological evolution of a flat anisotropic Universe in $f(T)$ gravity in the presence of a perfect fluid. It is shown that the matter content of the Universe has a significant impact of the nature of a cosmological singularity in th
Externí odkaz:
http://arxiv.org/abs/1907.12538
Publikováno v:
Phys. Rev. D 100, 083527 (2019)
We investigate the scalar field dynamics of models with nonminimally coupled scalar fields in the presence of the Gauss-Bonnet term and derive the structure of the effective potential and conditions for stable de Sitter solutions in general. Speciali
Externí odkaz:
http://arxiv.org/abs/1905.05085
Publikováno v:
Phys. Rev. D 98, 083538 (2018)
We examine the class of initial conditions which give rise to inflation. Our analysis is carried out for several popular models including: Higgs inflation, Starobinsky inflation, chaotic inflation, axion monodromy inflation and non-canonical inflatio
Externí odkaz:
http://arxiv.org/abs/1801.04948
Publikováno v:
Eur. Phys. J. C 78 (2018) no. 5, 377
Recently cosmological dynamics of anisotropic Universe in $f(T)$ gravity became an area of intense investigations. Some earlier papers devoted to this issue contain contradictory claims about the nature and propertied of vacuum solutions in this theo
Externí odkaz:
http://arxiv.org/abs/1711.07069
Publikováno v:
JCAP 1612 (2016) 006
We explore dynamics of cosmological models with bounce solutions evolving on a spatially flat Friedmann-Lemaitre-Robertson-Walker background. We consider cosmological models that contain the Hilbert-Einstein curvature term, the induced gravity term w
Externí odkaz:
http://arxiv.org/abs/1608.08214
Publikováno v:
Phys. Rev. D 90, 064044 (2014)
We explore dynamics of cosmological models with a nonminimally coupled scalar field evolving on a spatially flat Friedmann-Lemaitre-Robertson-Walker background. We consider cosmological models including the Hilbert-Einstein curvature term and the $N$
Externí odkaz:
http://arxiv.org/abs/1404.6226