报告题目：Probing Dark Matter–Neutrino Interactions with Cosmological Observations

报告人：祖磊 博士后（波兰国家核子研究中心）

报告摘要：In the early universe,neutrinos contributed significantly to the total energy density. If dark matter interacts with neutrinos,such interactions would leave imprints on both the Cosmic Microwave Background (CMB) and the large-scale structure of the universe. In this work,we combine data from Planck,the Atacama Cosmology Telescope (ACT),and three-year cosmic shear measurements from the Dark Energy Survey (DES-Y3) to investigate possible dark matter–neutrino interactions. Across different redshifts and scales,we consistently find a preference for an interaction strength of u～10^-4 ,with a statistical significance of around 3σ. While this level of interaction may face challenges from small-scale constraints,such as dwarf galaxy counts,these can be alleviated within specific neutrino portal dark matter models,where the interaction is only effective at particular energies (or redshifts),rather than being constant over time.

报告时间：2025年6月10日（周二）10:00

报告地点：仙林园区3-402室

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