Particle Theory Seminar | Brian Shuve (Harvey Mudd Coll.) ” Leptogenesis from Freeze-In”

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Abstract: Models of freeze-in feature a departure from equilibrium over an extended period of the early universe’s history, and they can naturally give rise to the observed matter-antimatter asymmetry. I will present several recent developments in freeze-in leptogenesis, including a new, testable mechanism for the simultaneous production of dark matter and baryogenesis via dark matter oscillations, as well as studies of freeze-in leptogenesis in models of hidden-sector neutrinos. I will highlight the connections between the early universe dynamics and phenomenology, including tests at colliders, and in cosmological and astrophysical observables.