Homogeneous and anisotropic cosmologies with affine EoS: a dynamical system perspective

A Singh - The European Physical Journal C, 2023 - Springer
We study a class of homogeneous and anisotropic geometries with affine equation of state
(EoS) for different physically plausible scenarios of the universe evolution using dynamical …

Cosmic dynamics and qualitative study of Rastall model with spatial curvature

A Singh, GP Singh, A Pradhan - International Journal of Modern …, 2022 - World Scientific
We investigate the cosmic dynamics of Rastall gravity in nonflat Friedmann–Robertson–
Walker (FRW) space–time with barotropic fluid. In this context, we are concerned about the …

Qualitative study of Lyra cosmologies with spatial curvature

A Singh - Chinese Journal of Physics, 2022 - Elsevier
We investigate the spatially curved Friedmann–Robertson–Walker space–time with Lyra
geometry model. The cosmological solutions are studied by using dynamical system …

Aspects of some Rastall cosmologies

A Singh, KC Mishra - The European Physical Journal Plus, 2020 - Springer
Rastall gravity paradigm producing mechanism for realizing singular and non-singular
cosmologies has been investigated. A solution in Rastall gravity with flat spatial sections …

Late-time acceleration from ekpyrotic bounce in gravity

AR Lalke, GP Singh, A Singh - International Journal of Geometric …, 2023 - World Scientific
In this paper, we investigate the late-time accelerated universe evolution in a flat,
homogeneous and isotropic model in the context of f (Q, T) gravity, where Q and T are non …

Qualitative aspects of Kantowski–Sachs cosmologies with cosmological constant and stiff fluid

A Singh - The European Physical Journal Plus, 2023 - Springer
Abstract Homogeneous and anisotropic Kantowski–Sachs model sourced by a stiff fluid and
cosmological constant has been explored for different possible scenarios of the universe …

On the anisotropic bouncing universe with viscosity

A Singh, R Raushan, R Chaubey - International Journal of …, 2023 - World Scientific
We investigate the role of bulk and shear viscosity in the spatially homogeneous anisotropic
spacetime, in particular, the Kantowski–Sachs (KS) spacetime. General conditions for the …

Qualitative aspects of Rastall gravity with barotropic fluid

A Singh, R Raushan, R Chaubey - Canadian Journal of …, 2021 - cdnsciencepub.com
We investigate the dynamical evolution of a homogeneous and isotropic flat universe filled
with a barotropic fluid satisfying the linear equation of state in Rastall gravity. Using the …

Photon production and elliptic flow from a momentum-anisotropic quark-gluon plasma

BS Kasmaei, M Strickland - Physical Review D, 2020 - APS
The emission of real photons from a momentum-anisotropic quark-gluon plasma (QGP) is
affected by both the collective flow of the radiating medium and the modification of the local …

Cosmic dynamics of isotropic models with inhomogeneous EoS: a dynamical system perspective

A Singh, AK Shukla… - International Journal of …, 2023 - ui.adsabs.harvard.edu
We examine the homogeneous and isotropic models sourced by the fluid having an
inhomogenous equation of state (EoS) using qualitative methods. The flat Friedmann …