Speaker
Description
In Rastall theory, the cosmological implications of new Tsallis holographic dark energy combined with the Rastall correction to General Relativity are investigated. A comprehensive data set—including Dark Energy Spectroscopic Instrument Baryon Acoustic Oscillations (Data Release 2), PantheonPlus Type Ia Supernovae, Hubble parameter measurements, and Big Bang Nucleosynthesis—is used to constrain model parameters via Markov Chain Monte Carlo analysis. Results indicate that this framework reproduces the present dark energy density parameter in agreement with the Lambda Cold Dark Matter model, while predictions for the Hubble parameter at intermediate redshifts show improved consistency with observations compared to the standard model. New Tsallis holographic dark energy alone cannot achieve this agreement. Dynamical stability analysis demonstrates a stable de Sitter fate for the Universe. The study also reinforces theoretical and observational bounds on the Rastall parameter and highlights the model’s testable departures from standard cosmology, providing a viable candidate for dynamical dark energy.