活动名称：FRB Dispersion Measure Distributions and Cosmological Applications

时间：2026年9月20日（星期日）时间点14:30

地点：博雅楼 503

主讲人：吴普训

主办单位：重庆师范大学物理与光电工程学院

主讲人简介：吴普训，湖南师范大学教授，博士生导师。主要从事引力理论与宇宙学方面的研究。在美国天体物理杂志快报、美国物理评论D等国际刊物发表论文100余篇，引用四千多次。主持了多项国家自然科学基金项目和湖南省创新研究群体项目。

活动简介：Fast radio bursts (FRBs) are extremely short-duration, highly luminous radio transients in the universe. During propagation, their pulse signals are dispersed by free electrons along the line of sight; therefore, their dispersion measures encode information on free electrons in the intergalactic medium and on the cosmic baryon distribution, making FRBs a promising cosmological probe. To fully exploit the cosmological potential of FRBs, it is necessary to accurately characterize the statistical distribution of their dispersion measures. In this talk, I will introduce our improvements to existing distribution functions for the intergalactic-medium dispersion measure, and present constraints on the Hubble constant derived from FRB observations. We further find that the dispersion measure of the Milky Way halo exhibits significant sky anisotropy. Based on this result, we construct an FRB cosmological analysis method that does not require assuming a Galactic dispersion-measure model, thereby improving the robustness of cosmological constraints from FRBs.