Speaker
Description
Sign-switching cosmological constant cold dark matter ($\Lambda_{\rm s}$CDM) cosmology has emerged as a compelling new paradigm, demonstrating unprecedented success in aligning with observational data from various datasets and effectively resolving major cosmological tensions. This model is characterized by a minimal deviation from the standard $\Lambda$CDM model, proposing a rapid Anti-de Sitter (AdS) to de Sitter (dS) transition in the late universe ($z_\dagger\sim 1.7$), inspired by the graduated dark energy (gDE) model. In this talk, we will first provide a concise introduction to $\Lambda_{\rm s}$CDM cosmology. We will then discuss the latest theoretical and observational developments that underscore $\Lambda_{\rm s}$CDM as a promising candidate or guide for a new concordance cosmological model of the Universe.
