Affleck-Dine Leptoflavorgenesis, sterile neutrino dark matter, and the helium anomaly

by Dr Kensuke Akita (The University of Tokyo)

Wednesday 29 Oct 2025, 11:30 → 12:30 Europe/Zurich

4/2-011 - TH common room (CERN)

We propose a scenario with primordial large lepton flavor asymmetries, which simultaneously addresses some cosmological puzzles: resolve the recently reported helium-4 anomaly, open up a new parameter space of sterile neutrino dark matter consistent with all observational bounds, and explain the observed baryon asymmetry. To demonstrate that this scenario is possible, we propose Affleck-Dine Leptoflavorgenesis with Q-ball formation and develop a methodology to robustly estimate the sterile neutrino DM abundance with large lepton flavor asymmetries.