A number of challenges to the standard Λ CDM model have been emerging during the past
few years as the accuracy of cosmological observations improves. In this review we discuss …

It is well known that quantum field theory (QFT) induces a huge value of the cosmological
constant (CC), Λ, which is outrageously inconsistent with cosmological observations. We …

The Etherington reciprocity theorem, or distance duality relation (DDR), relates the mutual
scaling of cosmic distances in any metric theory of gravity where photons are massless and …

A dark energy with a negative energy density in the past can simultaneously address
various cosmological tensions, and if it is to be positive today to drive the observed …

We apply the formalism of dynamical system analysis to investigate the evolution of
interacting dark energy scenarios at the background and perturbation levels in a unified …

We present observational constraints on the coupling between dark components of
anisotropic Bianchi type I universe. We assume interaction between dark matter and dark …

The proposed model is a study of the nature of dark energy through nonextensive Tsallis
entropy. The method is based on the Karolyhazy relation which is a combined idea from …

This paper aims to study the stability analysis of Friedmann-like spacetime in the presence
of torsion through dynamical system techniques. For this purpose, we consider equations of …

In this paper we study a model of interacting dark energy–dark matter where the ratio
between these components is not constant, changing from early to late times in such a way …

The purpose of this paper is to study the Tsallis agegraphic dark energy with an interaction
term between dark energy and dark matter in the DGP brane-world scenario. For this, we …