报告题目一：引力透镜效应与暗物质性质

报告人：李正祥 教授（北京师范大学）

报告摘要：在标准宇宙学框架下，冷暗物质模型面临一些问题与挑战，从而促使人们去探寻一些可能的暗物质候选者，包括温暗物质、自相互作用暗物质、极轻（轴子或类轴子，波动，模糊）暗物质，以及宏观的大质量致密晕天体等。不同的暗物质模型或候选者会预言不同且丰富的天体物理观测结果。在本次报告中，我将简单介绍课题组近期在利用引力透镜观测研究极轻暗物质和宏观的大质量致密晕天体暗物质性质方面的一些结果。期待和大家的讨论与交流。

报告题目二：Gravitational-Wave Cosmology with DECi-hertz Interferometer Gravitational-wave Observatory

报告人：曹硕 教授（北京师范大学）

报告摘要：It has been a half-decade since the first direct detection of gravitational waves, which signifies the coming of the era of the gravitational-wave astronomy and gravitational-wave cosmology. The increasing number of the detected gravitational-wave events has revealed the promising capability of constraining various aspects of cosmology. Interestingly, like the strong gravitational lensing of optical signals, GW lensing attracted many interests in the last decade. Though currently, we have not yet found any sufficient evidence for the GW lensing signal from the released LIGO data, the development of the methodology of applying GW lensing to cosmology still deserves many studies. In this talk, I will give a brief introduction of our recent works based on the DECi-hertz Interferometer Gravitational-wave Observatory (DECIGO)-a future Japanese space gravitational-wave antenna, focusing on the GW strong lensing and its extensive applications in cosmology, fundamental physics and astrophysics.

报告地点：紫台仙林园区5号楼516会议室

报告时间：2026年9月18日（周五）14:00

欢迎大家参加！