Zobrazeno 1 - 10
of 906
pro vyhledávání: '"Pozdeeva, A. A."'
Slow-roll approximations in Einstein--Gauss--Bonnet gravity formulated in terms of e-folding numbers
Autor:
Pozdeeva, E. O.
In the Einstein--Gauss--Bonnet (EGB) gravity models, the slow-roll approximation was extended taking into account the first order of slow-roll parameter $\delta_1 =-2\,H^2\,\xi^\prime/U_0$ proportional to derivative of the Gauss-Bonnet coupling funct
Externí odkaz:
http://arxiv.org/abs/2411.16194
Autor:
Pozdeeva, E. O., Vernov, S. Yu.
We propose a two-field inflationary model with the induced gravity term. Using conformal transformation of the metric, we get the chiral cosmological model with two scalar fields. We demonstrate that the constructed inflationary model does not contra
Externí odkaz:
http://arxiv.org/abs/2407.00999
Autor:
Kamenshchik, Alexander Y., Pozdeeva, Ekaterina O., Tribolet, Augustin, Tronconi, Alessandro, Venturi, Giovanni, Vernov, Sergey Yu.
The superpotential method is a reconstruction technique which has proven useful to build exact cosmological solutions. We here employ the superpotential method in order to reconstruct the features necessary for the inflaton potential to drive inflati
Externí odkaz:
http://arxiv.org/abs/2406.19762
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:
SPACE, TIME AND FUNDAMENTAL INTERACTIONS, 2024, V. 1 (46), P. 90
We propose the method for construction of $F(R,\xi)$ gravity model, unifying inflation and primordial black hole formation. The proposed models are based on the Starobinsky $R+R^2$ inflationary model, so, the function $F(R,\xi)$ is a quadratic polyno
Externí odkaz:
http://arxiv.org/abs/2401.12040
Publikováno v:
Phys. Scr. 98 (2023) 055001
We propose a one-parametric extension of the Starobinsky $R+R^2$ model by adding the $(R+m^2\beta^2)^{3/2}$ term. The parameter $m$ is the inflaton mass, which is determined in the same way as in the Starobinsky model, and $\beta$ is a dimensionless
Externí odkaz:
http://arxiv.org/abs/2211.10988
Superstring/M-theory is the theory of quantum gravity that can provide the UV-completion to viable inflation models. We modify the Starobinsky inflation model by adding the Bel-Robinson tensor $T^{\mu\nu\lambda\rho}$ squared term proposed as the lead
Externí odkaz:
http://arxiv.org/abs/2211.01546
Publikováno v:
JCAP 03 (2022) 058
We study several extensions of the Starobinsky model of inflation, which obey all observational constraints on the inflationary parameters, by demanding that both the inflaton scalar potential in the Einstein frame and the $F(R)$ gravity function in
Externí odkaz:
http://arxiv.org/abs/2111.09058
Autor:
Pozdeeva, Ekaterina O.
Publikováno v:
Universe (2021) 7, no. 6: 181
We consider Einstein-Gauss-Bonnet (EGB) inflationary models using the effective potential approach. We present evolution equations in the slow-roll regime using the effective potential and the tensor-to-scalar ratio. The choice of the effective poten
Externí odkaz:
http://arxiv.org/abs/2105.02772
Autor:
Vernov, Sergey, Pozdeeva, Ekaterina
Publikováno v:
Universe 2021, 7(5), 149
De Sitter solutions play an important role in cosmology because the knowledge of unstable de Sitter solutions can be useful to describe inflation, whereas stable de Sitter solutions are often used in models of late-time acceleration of the Universe.
Externí odkaz:
http://arxiv.org/abs/2104.11111