Can f (R) gravity isotropise a pre-bounce contracting universe?

S Arora, S Mandal, S Chakraborty… - Journal of Cosmology …, 2022 - iopscience.iop.org
We address the important issue of isotropisation of a pre-bounce contracting phase in f (R)
gravity, which would be relevant to constructing any viable nonsingular bouncing scenario in …

Some bianchi type cosmological models in f (R, ϕ) gravity

A Malik, S Ahmed, S Mahmood - New Astronomy, 2020 - Elsevier
In this paper, we study three different Bianchi type line elements, like Bianchi type-I (BT-I),
Bianchi type-III (BT-III) and Kantowski Sachs space-time in the framework of f (R, ϕ) theory of …

Reconstruction of the singularity-free gravity via Raychaudhuri equations

GN Gadbail, S Arora, PK Sahoo, K Bamba - The European Physical …, 2024 - Springer
We study the bounce cosmology to construct a singularity-free f (R) model using the
reconstruction technique. The formulation of the f (R) model is based on the Raychaudhari …

Magnetic Bianchi-I cosmology in the Horndeski theory

RK Muharlyamov, TN Pankratyeva… - Modern Physics Letters …, 2024 - World Scientific
In this paper, we study the evolution of Bianchi-I spacetimes within the framework of the
Horndeski theory with G 5= const./X. The spacetimes are filled a global unidirectional …

Dynamical equivalence of gravity in Jordan and Einstein frames

S Chakraborty, S Pal, A Saa - Physical Review D, 2019 - APS
We investigate the dynamics of f (R) gravity in Jordan and Einstein frames. First, we perform
a phase-space singularities analysis in both frames. We show that, typically, anisotropic …

[PDF][PDF] Isotropization of the magnetic universe in Horndeski theory with G 3 (X, ϕ) and G 5 (X)

RK Muharlyamov, TN Pankratyeva, SOA Bashir - Chinese Physics C, 2024 - cpc.ihep.ac.cn
Isotropization of the magnetic universe in Horndeski theory with G3(X,ϕ) and G5(X) Page 1
Isotropization of the magnetic universe in Horndeski theory with G3(X,ϕ) and G5(X) Ruslan K …

The nonlinear anisotropic model of the Universe with the linear potential

RK Muharlyamov, TN Pankratyeva - Indian Journal of Physics, 2023 - Springer
In the Bianchi I cosmology some subclasses of the Horndeski theory allow for the non-
standard anisotropy behavior. For example, the anisotropy is damped near the initial …

[引用][C] Cosmological solutions of open FLRW metric in f (R, G) gravity: observational aspects

A Dixit, A Singh, S Krishnannair - International Journal of Geometric …, 2024 - World Scientific
We investigate the cosmic evolution of the universe in context of f (R, G) gravity with
homogeneous and isotropic background, where R represents the Ricci scalar, and G …