# Constraining a dark matter and dark energy interaction scenario with a dynamical equation of state

## TL;DR

This paper constrains a dark matter-dark energy interaction model using recent cosmological data, finding the interaction consistent with zero and showing dark matter pressure can mimic the same evolution.

## Contribution

It introduces a flexible dark energy equation of state with interaction parameter and constrains it using multiple recent cosmological observations.

## Key findings

- Interaction consistent with zero within 1σ
- Dark matter pressure can reproduce similar evolution
- Constraints derived from combined cosmological data

## Abstract

In this work we have used the recent cosmic chronometers data along with the latest estimation of the local Hubble parameter value, $H_0$ at 2.4\% precision as well as the standard dark energy probes, such as the Supernovae Type Ia, baryon acoustic oscillation distance measurements, and cosmic microwave background measurements (PlanckTT $+$ lowP) to constrain a dark energy model where the dark energy is allowed to interact with the dark matter. A general equation of state of dark energy parametrized by a dimensionless parameter `$\beta$' is utilized. From our analysis, we find that the interaction is compatible with zero within the 1$\sigma$ confidence limit. We also show that the same evolution history can be reproduced by a small pressure of the dark matter.