Phantom Dark Energy Behavior in Weyl Type f(Q,T) Gravity Models with Observational Constraints

This study explores the behavior of phantom dark energy within the framework of Weyl-type f(Q,T) gravity, considering a spatially flat FLRW universe under observational constraints. The field equations are analytically solved for a dust-like fluid source. To determine the present values of the model parameters, we utilize observational data from the Hubble parameter measurements via cosmic chronometers (CC) and the apparent magnitude data from the Pantheon compilation of Type Ia supernovae (SNe Ia). With these obtained parameter values, we analyze the model’s physical characteristics by evaluating the effective and dark energy equation of state parameters ωeff and ωde, the deceleration parameter q(z), and energy conditions. Additionally, we conduct the Om diagnostic test for the model. We estimate the transition redshift zt≤0.5342, 0.6334 and the present age of the universe t0=13.46, 13.49 Gyrs with H0=67.4±3.6, 68.8±1.9 Km/s/Mpc, Ωm0=0.41−0.24+0.13, 0.299−0.077+0.042, and ωeff=−0.6447,−0.696, ωde=−1.0347,−1.0284. We find a transit phase accelerating and physically acceptable phantom dark energy model of the universe.