Chameleon fields may modify gravity on cluster scales while recovering general relativity
locally. This article reviews signatures of chameleon modifications in the nonlinear …

We investigate clustering properties of dark matter halos and galaxies to search for optimal
statistics and scales where possible departures from general relativity (GR) could be found …

We present a simple fitting formula for the scale-dependent growth rate of Hu-Sawicki model
in f (R) modified gravity. We compare the accuracy of the fitting function against numerical …

The standard model of cosmology with nearly Gaussian, isotropic, scale invariant and
adiabatic initial conditions describes the cosmological observations well. However, the study …

Cross correlation of the Integrated Sachs-Wolfe signal (ISW) with the galaxy distribution in
late time is a promising tool for constraining the dark energy properties. Here, we study the …

Inspired by nonlocal gravity theories, time-delayed cosmology proposes a delayed
Friedmann equation that generically predicts an inflationary period with a natural end. The …

In the present paper, we study the capability of interacting dark energy model with pure
momentum transfer in the dark sector to reconcile tensions between low redshift …

We propose a new probe to test the nature of gravity at various redshifts through large-scale
cosmological observations. We use our void catalog, extracted from the Sloan Digital Sky …

Here, we investigate the growth of matter density perturbations as well as the generalized
second law (GSL) of thermodynamics in the framework of $ f (R) $-gravity. We consider a …