Exploring Coupled Quintessence in light of CMB and DESI DR2 measurements

Abstract

We perform a detailed analysis of a theoretically motivated dark energy quintessence model which interacts with the dark matter sector of the universe. Utilising the current observational datasets from the Cosmic Microwave Background, Baryon Acoustic Oscillations and Type Ia Supernovae, we constrain the parameters that characterise the strength of the time dependent interaction. We also look at the effect of a warm dark matter component in the context of coupled quintessence. Analysis using Deviance Information Criterion indicates strong preference for the quintessence model coupled with warm dark matter. However, Bayesian evidence analysis shows favor in the direction of $\Lambda$CDM model.