# Interacting scenarios with dynamical dark energy: observational constraints and alleviation of the $H_0$ tension

## TL;DR

This study explores interacting dynamical dark energy models using recent observational data, finding non-zero interactions and phantom behavior, which help reconcile local and cosmological measurements of the Hubble constant.

## Contribution

It introduces and constrains a class of interacting dynamical dark energy models with various equations of state using multiple observational datasets.

## Key findings

- Non-zero interaction detected in all models
- Dark energy equation of state is in the phantom regime
- Hubble parameter estimates are closer to local measurements

## Abstract

We investigate interacting scenarios which belong to a wider class, since they include a dynamical dark energy component whose equation of state follows various one-parameter parametrizations. We confront them with the latest observational data from Cosmic Microwave Background (CMB), Joint light-curve (JLA) sample from Supernovae Type Ia, Baryon Acoustic Oscillations (BAO), Hubble parameter measurements from Cosmic Chronometers (CC) and a gaussian prior on the Hubble parameter $H_0$. In all examined scenarios we find a non-zero interaction, nevertheless the non-interacting case is allowed within 2$\sigma$. Concerning the current value of the dark energy equation of state for all combination of datasets it always lies in the phantom regime at more than two/three standard deviations. Finally, for all interacting models, independently of the combination of datasets considered, the estimated values of the present Hubble parameter $H_0$ are greater compared to the $\Lambda$CDM-based Planck's estimation and close to the local measurements, thus alleviating the $H_0$ tension.