f (T) teleparallel gravity and cosmology

YF Cai, S Capozziello, M De Laurentis… - Reports on Progress …, 2016 - iopscience.iop.org
Over recent decades, the role of torsion in gravity has been extensively investigated along
the main direction of bringing gravity closer to its gauge formulation and incorporating spin …

Exploring bouncing cosmologies with cosmological surveys

YF Cai - Science China Physics, Mechanics & Astronomy, 2014 - Springer
From recent observational data two significant directions have been made in the field of
theoretical cosmology recently. First, we are now able to make use of present observations …

Towards a nonsingular bouncing cosmology

YF Cai, DA Easson… - Journal of Cosmology and …, 2012 - iopscience.iop.org
We present a nonsingular bouncing cosmology using single scalar field matter with non-
trivial potential and non-standard kinetic term. The potential sources a dynamical attractor …

Bouncing galileon cosmologies

T Qiu, J Evslin, YF Cai, M Li… - Journal of Cosmology and …, 2011 - iopscience.iop.org
We present nonsingular, homogeneous and isotropic bouncing solutions of the conformal
Galileon model. We show that such solutions necessarily begin with a radiation-dominated …

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 …

The matter bounce curvaton scenario

YF Cai, R Brandenberger, X Zhang - Journal of Cosmology and …, 2011 - iopscience.iop.org
Massless scalar fields originating in a quantum vacuum state acquire a scale-invariant
spectrum of fluctuations in a matter-dominated contracting universe. We show that these …

Dynamical analysis of anisotropic scalar-field cosmologies for a wide range of potentials

CR Fadragas, G Leon… - Classical and Quantum …, 2014 - iopscience.iop.org
We perform a detailed dynamical analysis of anisotropic scalar-field cosmologies, and in
particular of the most significant Kantowski–Sachs, locally rotationally symmetric (LRS) …

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 …

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 …

Dynamics of the anisotropic Kantowsky–Sachs geometries in Rn gravity

G Leon, EN Saridakis - Classical and Quantum Gravity, 2011 - iopscience.iop.org
We construct general anisotropic cosmological scenarios governed by an f (R) gravitational
sector. Focusing then on Kantowski–Sachs geometries in the case of R n-gravity, and …