Rethinking Cosmology

Rethinking Cosmology seeks to critically evaluate the prevailing ΛCDM cosmological model, which has successfully explained most cosmological data for decades but now faces significant anomalies and tensions—such as discrepancies in the Hubble expansion rate and challenges to the Cosmological Principle—as new, more precise observations emerge. It will provide a forum to address these issues by fostering consensus on future observational and theoretical approaches, exploring synergies with fundamental physics, and charting new research directions. In addition, the program holds particular relevance for the Indian community, which is actively engaged in major international projects, including CMB studies and upcoming observatories like the SKA and Rubin-LSST, and aims to leverage these collaborations to push the frontiers of cosmology.