Cosmic Perturbations and Baryon Asymmetry from a Rotating Field

by Taegyu lee (University of Indiana, Bloomington)

Tuesday 4 Aug 2026, 16:00 → 17:30 Asia/Seoul

Room 1423 (KIAS)

Title: Cosmic Perturbations and Baryon Asymmetry from a Rotating Field

Speaker: Taegyu Lee

Abstract:

In the Affleck–Dine mechanism, the baryon asymmetry is generated by the rotational motion of a scalar field along a flat direction. We study a concrete SUSY flat direction in which the same scalar field can generate baryon number as well as work as a curvaton. This well-motivated setup can naturally lead to a slightly red tilted spectrum with ns<1 which is usually non-trivial since it needs some fine tuning in the curvature of the potential. In this set up, we determine the region of parameter space consistent with the observed adiabatic curvature perturbations. We also show that the observed baryon asymmetry can be generated while keeping baryon isocurvature consistent with Planck measurement. Finally, we discuss how dark matter can be incorporated consistently within the same framework.