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PIRSA:22100144

Video URL

https://pirsa.org/22100144

BBN circa 2022: New Physics hints from the Early Universe?

Valli, M. (2022). BBN circa 2022: New Physics hints from the Early Universe?. Perimeter Institute for Theoretical Physics. https://pirsa.org/22100144

Mauro Valli National Institute for Nuclear Physics

Talk numberPIRSA:22100144
DOI10.48660/22100144
Source RepositoryPIRSA
Collection
Talk Type Scientific Series
Subject

Abstract

Bang Nucleosynthesis (BBN) is one of the greatest outcome of the Standard Model of Particle Physics when put next to ΛCDM cosmology. In this talk, I will first review the key aspects of standard BBN and illustrate a new code -- PRyMordial -- to make state-of-the-art predictions of primordial light-element abundances within and beyond the Standard Model. I will then highlight the latest measurements regarding the primordial abundance of helium-4 and deuterium, and present evidence at the 2 sigma level for a nonzero lepton asymmetry from BBN data jointly with the Cosmic Microwave Background. I will leave some final comments on how a large total lepton asymmetry can be consistently realized in the Early Universe.

Zoom Link: https://pitp.zoom.us/j/95011247645?pwd=S0EwZG9nSHQvTjV0QjBxeHNUWWtmUT09