报告题目一：Exploring Dark Universe with Migdal Effect

报告人：武雷 教授（南京师范大学）

报告时间：2026年06月04（周四）10:00

报告摘要：宇宙中暗物质的存在已获大量实验证实，其性质研究是当前粒子物理、天文学和宇宙学的共同前沿。本报告将介绍轻暗物质研究的理论进展，特别是近期MARVAL合作组在中子与原子核散射过程中首次直接观测到的Migdal效应，并探讨未来在中微子实验中研究Migdal效应的可能性。

报告题目二：Gauge-invariant analysis of curvature perturbations and gravitational waves from slow first-order phase transitions

报告人：丁然 副教授（安徽大学）

报告时间：2026年06月04（周四）11:00

报告摘要：When strongly supercooled cosmological first-order phase transitions (FOPTs) proceed sufficiently slowly, superhorizon inhomogeneities can be generated. We compute these super-horizon curvature perturbations using a gauge-invariant multi-fluid formalism. We show that primordial black holes are unlikely to form from such inhomogeneities, and derive a fitting formula for the resulting curvature perturbations as well as the associated scalar-induced gravitational waves. In the second part of this talk, I will briefly present our recent work on the radio detection of the high-frequency gravitational wave background based on the Hongmeng Project.

报告地点：仙林园区3-201室

欢迎大家参加！