A study of dark matter-dark energy interaction under the DESI DR2 data constraint

While $Λ$CDM provides a good fit to cosmological data, it fails to address many of the outstanding questions in contemporary cosmology. Chief among these are the Hubble tension and the apparent dynamical nature of dark energy as inferred from the recent DESI DR2 analysis. In this work, we analyze a field-theoretic description of cosmology where both dark energy and dark matter are interacting spin zero fields. We give a thorough study of a wide range of the interaction strength and demonstrate the effect on the dark energy equation of state and the Hubble tension. Using the recent cosmological data, we extract constraints on cosmological parameters including the free parameters of the model.

💡 Research Summary

The paper investigates a field‑theoretic model in which dark matter (DM) and dark energy (DE) are represented by two interacting spin‑0 scalar fields, χ and ϕ, respectively. The action consists of the Einstein‑Hilbert term, individual potentials V₁(χ)=½ m²χ² for DM and V₂(ϕ)=μ⁴