Interacting dark matter and modified holographic Ricci dark energy plus a noninteracting cosmic component

TL;DR

This paper explores a cosmological model with interacting dark matter, modified holographic Ricci dark energy, and a radiation-like component, constraining parameters with observational data and analyzing early universe dark energy behavior.

Contribution

It introduces a nonlinear interaction model in dark sector densities and assesses early dark energy constraints for MHRDE and holographic Ricci models.

Findings

MHRDE is consistent with early dark energy bounds.

Holographic Ricci dark energy does not meet early universe constraints.

Parameter constraints are derived from observational Hubble data.

Abstract

We investigate a spatially flat Friedmann-Robertson-Walker universe that has an interacting dark matter, a modified holographic Ricci dark energy (MHRDE), plus a third, decoupled component that behaves as a radiation term. We consider a nonlinear interaction in the dark component densities and their derivatives up to second order. We apply the $\chi^{2}$ method to the observational Hubble data for constraining the cosmological parameters and analyze the amount of dark energy in the radiation era for both MHRDE and holographic Ricci dark energy models. The former is consistent with the bound $\Omega_{x}(z\simeq 1100)<0.1$ reported for the behavior of dark energy at early times while the latter does not fulfill it.