Student Colloquium: Pedro Schwaller
"Leptogenesis as the origin of matter."
Abstract: After the Big Bang, matter and anti-matter are produced in equal amounts. However today the visible universe consists purely of matter, while no significant abundance of anti-matter is observed. This imbalance is commonly referred to as the Baryon Asymmetry of the Universe (BAU).
In this presentation, the conditions to generate a baryon asymmetry in the evolution of the early universe are reviewed. Then Leptogenesis is introduced, a concrete mechanism to generate the BAU based on a model for neutrino masses.
The prediction of the final baryon asymmetry in terms of a set of model parameters requires elements of general relativity, statistical mechanics and quantum field theory. I briefly introduce the essential ingredients. Then I discuss recent results from a unified approach to this problem, using methods of nonequilibrium quantum field theory.