Coupled Quintessence scalar field model in light of observational datasets

Abstract

We do a detailed analysis of a well-theoretically motivated interacting dark energy scalar field model with a time-varying interaction term. Using current cosmological datasets from CMB, BAO, Type Ia Supernova, $H(z)$ measurements from cosmic chronometers, angular diameter measurements from Megamasers, growth measurements, and local SH0ES measurements, we found that dark energy component may act differently than a cosmological constant at early times. The observational data also does not disfavor a small interaction between dark energy and dark matter at late times. When using all these datasets in combination, our value of $H_0$ agrees well with SH0ES results but in 2.5$\sigma$ tension with Planck results. We also did AIC and BIC analysis, and we found that the cosmological data prefer coupled quintessence model over $\Lambda$CDM, although the chi-square per number of degrees of freedom test prefers the latter.

22 pages, 9 figures, and 7 tables; Accepted for publication in JCAP

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• Robust Preference for Dynamical Dark Energy in DESI BAO and SN Measurements
• Role of Spatial Curvature in a Dark Energy Interacting Model
• Is Dark Energy an Effective Manifestation of Non-equilibrium Thermodynamics? -- Insights from DESI