Updated constraints on omnipotent dark energy: a comprehensive analysis with CMB and BAO data

In this work, we present updated observational constraints on the parameter space of the DMS20 darkenergy model, a member of the omnipotent dark-energy (ODE) class. Our analysis combines multiple cosmic microwave background datasets—including measurements from the Planck satellite (PL18), the South Pole Telescope (SPT), and the Wilkinson Microwave Anisotropy Probe (WMAP)—with Type Ia supernova data from the Pantheon þ catalog (PP), and baryon acoustic oscillation measurements from the Dark Energy Spectroscopic Instrument and Sloan Digital Sky Survey. We find that certain data combinations, such as SPT þ WMAP þ BAO and PL18 þ BAO, can reduce the significance of the H0 tension below 1σ, but with considerably large uncertainties. However, the inclusion of PP data restores the tension in H0. To provide a comprehensive view of the ODE phenomenology, we also investigate the evolution of its energy density, emphasizing its dynamical behavior at low redshifts. Our results generically exhibit multiple phantom divide line crossings in a single expansion history; if confirmed, this points beyond the simplest minimally coupled canonical single-field quintessence/phantom descriptions and motivates more general dark-sector realizations.