Cosmological model with interactions in the dark sector

TL;DR

This paper proposes a cosmological model where dark energy and dark matter interact via their effective barotropic indexes, fitting observational data to demonstrate realistic universe evolution.

Contribution

It introduces a new interacting dark sector model with dynamic coupling based on energy density ratios, fitted to Hubble data.

Findings

The model reproduces expected deceleration and acceleration phases.

The densities and luminosity distances match observational expectations.

The interaction leads to stable energy density ratios over time.

Abstract

A cosmological model is proposed for the current Universe consisted of non-interacting baryonic matter and interacting dark components. The dark energy and dark matter are coupled through their effective barotropic indexes, which are considered as functions of the ratio between their energy densities. It is investigated two cases where the ratio is asymptotically stable and their parameters are adjusted by considering best fits to Hubble function data. It is shown that the deceleration parameter, the densities parameters, and the luminosity distance have the correct behavior which is expected for a viable present scenario of the Universe.