报告题目：Decay-Assisted Leptogenesis during Preheating

报告人：赵文斌 博士后（国际理论物理中心（亚太地区））

报告摘要：Leptogenesis is among the most elegant mechanisms to generate baryon asymmetry in our universe, which only requires the existence of heavy right-handed neutrinos with CP-violating decays that generate lepton asymmetry. These right-handed neutrinos can be non-perturbatively produced directly after inflation, from the oscillating inflaton background. In this talk, we will revisit this mechanism during preheating using the quantum Boltzmann equations. This framework allows us to study the production and decay of heavy right-handed neutrinos in a consistent manner. Due to their fermionic nature, heavy neutrino production can saturate after a few inflaton oscillations when their occupation numbers approach unity. Their decays can deplete their occupation numbers, allowing more particles to be produced and generating a larger lepton asymmetry. Compared with the stable case, we find that the final baryon asymmetry can be enhanced by two orders of magnitude.

报告时间：2026年10月20日（周二）14:00

报告地点：仙林园区3-402室

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