报告题目：Cosmological Signatures of Neutrino Seesaw

报 告 人：韩成成 (Sun Yet-sen University)

报告时间：2025年1月8日14：00

报告地点：物理楼W218

内容摘要：The tiny neutrino masses are most naturally explained by the seesaw mechanism through singlet right-handed neutrinos, which can further explain the matter-antimatter asymmetry in the universe. We propose a new approach to study cosmological signatures of neutrino seesaw through the interaction between inflaton and right-handed neutrinos. After inflation the inflaton predominantly decays into right-handed neutrinos and its decay rate is modulated by the fluctuations of Higgs field which act as the source of curvature perturbations. We demonstrate that this modulation produces primordial non-Gaussian signatures, which can be measured by the forthcoming large-scale structure surveys. We find that these surveys have the potential to probe a large portion of the neutrino seesaw parameter space, opening up a new window for testing the high scale seesaw mechanism.

报告人简介：韩成成，中山大学副教授，于2014年在中国科学院理论物理研究所博士毕业，2014-2020年分别在亚太理论物理中心(APCTP)、东京大学卡弗里数物连携宇宙研究机构(Kavli IPMU)和韩国高等研究院(KIAS)从事博士后研究。2020年入选中山大学中青年杰出人才计划，现任副教授，博士生导师。迄今已在PRL, JHEP等杂志发表论文五十余篇，总引用两千多次。主要研究兴趣包括LHC新物理、粒子宇宙学、暗物质等相关物理。