12:00–1:00 pm ERC 401
Tanvi Karwal (University of Pennsylvania) "The Hubble tension and theoretical, new-physics solutions"
The Hubble tension persists and continues to raise questions about our current understanding of the Universe. The discrepancy is greatest between two constraints on the current expansion rate of the Universe - one assuming LCDM and observing the early universe, and another directly measuring H0 in the local universe. I have worked extensively on understanding what this tension may indicate about the dark sector by building theoretical models to resolve this tension, the most successful being the early dark energy (EDE) scenario. My talk will go over the phenomenological features that allow EDE to successfully resolve the Hubble tension and some theoretical models with these features. I will also discuss challenges that EDEs face - in particular, another milder cosmological anomaly, the emerging large-scale structure tension; and how we may pursue cosmological concordance.
