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 …

Abstract Models where dark matter and dark energy interact with each other have been
proposed to solve the coincidence problem. We review the motivations underlying the need …

We explore whether nonstandard dark sector physics might be required to solve the existing
cosmological tensions. The properties we consider in combination are (a) an interaction …

We examine interactions between dark matter and dark energy in light of the latest
cosmological observations, focusing on a specific model with coupling proportional to the …

We investigate the observational constraints on an interacting vacuum energy scenario with
two different neutrino schemes (with and without a sterile neutrino) using the most recent …

The well-known tensions on the cosmological parameters H_0 H 0 and σ _8 σ 8 within the Λ
Λ CDM cosmology shown by the Planck-CMB and LSS data are possibly due to the …

We consider the possibility of an interaction in the dark sector in the presence of massive
neutrinos and study the observational constraints on three different scenarios of massive …

The interaction between dark matter and dark energy can be incorporated into field theory
models of dark energy that have proved successful in alleviating the coincidence problem …

In this review we consider in detail different theoretical topics associated with interaction in
the dark sector. We study linear and nonlinear interactions which depend on the dark matter …

Theoretical approaches to explaining the observed acceleration of the universe are
reviewed. We briefly discuss the evidence for cosmic acceleration, and the implications for …