Testing the Λs CDM model in Rastall gravity with current cosmological observations — E8 Intelligence Research

The idea of a mirror AdS-dS transition induced by a rapidly sign-switching cosmological constant in the late universe forms the basis of the ΛsCDM model in general relativity. In this paper, we replace general relativity with minimal deviation Rastall gravity in a sign-switch dark energy model, and also investigate the significant cosmology parameters derived for the Rastall-ΛsCDM model at the background level. We evaluate this model using a comprehensive set of recent observational data, including DESI survey (Baryon Acoustic Oscillations), Type Ia Supernovae samples (PantheonPlus, DES5yr, SH0ES), and Planck (Cosmic Microwave Background). We find that the Rastall parameter ϵ constraint reveals only a 3.4σ departure from zero (GR-based ϵ=0) with an amplitude of order 10-3 Author: Andrew Stewart Caldin, Independent Researcher, UK. Part of the E8 Intelligence Research series. Platform: e8intelligence.com