We study the Carrollian limit of the (general) quadratic gravity in four dimensions. We find
that in order for the Carrollian theory to be a modification of the Carrollian limit of general …

We explore exact f (R) gravity solutions that mimic Chaplygin-gas inspired Λ CDM
cosmology. Starting with the original, generalized and modified Chaplygin-gas (MCG) …

One of the exact solutions of f (R) theories of gravity in the presence of different forms of
matter exactly mimics the ΛCDM solution of general relativity (GR) at the background level …

We present a reconstruction technique for models of f (R) gravity from the Chaplygin scalar
field in flat de Sitter spacetimes. Exploiting the equivalence between f (R) gravity and scalar …

Abstract 3+ 1 3+ 1 formulations of the Einstein field equations have become an invaluable
tool in Numerical relativity, having been used successfully in modeling spacetimes of black …

In this paper, we explore classes of irrotational-fluid cosmological models in the context of f
(R)-gravity in an attempt to put some theoretical and mathematical restrictions on the form of …

We study a class of shear-free, homogeneous but anisotropic cosmological models with
imperfect matter sources in the context of f (R) gravity. We show that the anisotropic stresses …

We investigate the integrability conditions of a class of shear-free perfect-fluid cosmological
models within the framework of anisotropic fluid sources, applying our results to f (R) dark …

The lightcone gauge is a set of what are called the observational coordinates adapted to our
past lightcone. We develop this gauge by producing a perturbed spacetime metric that …

The purpose of this paper is to investigate the oscillatory behavior of the universe through a
Schr\" odinger-like Friedmann equation and a modified gravitational background described …