Speaker: Dr. Yi-Peng Wu (Academia Sinica)
Talk title: Probing Affleck-Dine baryogenesis with primordial features
Time: 2026/04/13 (Mon.) 12:30
Place: NCTS Physics 4F Lecture Hall, Cosmology Hall, NTU

Abstract: 
The Affleck–Dine mechanism is a leading baryogenesis scenario driven by the relaxation of a charged scalar condensate in the primordial Universe. Using recent Cosmic Microwave Background constraints on baryon-density isocurvature perturbations, we update the viable parameter space for Affleck–Dine baryogenesis from supersymmetric flat-direction models, taking quantum fluctuations of the charged scalar condensate generated during inflation as initial conditions. In this talk, I will show that primordial features in the inflationary background can serve as a unique probe of baryogenesis from flat-direction models, whose mechanisms are otherwise difficult to access directly due to their high energy scales. These primordial features can leave correlated imprints, such as sharp feature signals and clock signals, on both the curvature and baryon-density isocurvature perturbations, providing direct evidence for the existence of light and heavy modes involved in the Affleck–Dine mechanism.