题 目：Recent progress on the study of cosmological gravitational wave background
报 告 人：王赛 副研究员 中国科学院高能物理研究所
时 间：2024年11月28日 (星期四) 上午10:00
地 点：LE201
邀 请 人：朱庆华
报告摘要：Recently, Pulsar Timing Array collaborations have discovered significant evidence of the nano-Hertz gravitational wave background. This has sparked extensive discussions in the academic community regarding the sources of gravitational waves, with strong interest in cosmological sources in addition to supermassive black holes. This report will focus on the research progress of scalar-induced gravitational waves. We will explore the significant contribution of primordial non-Gaussianity to scalar-induced gravitational waves and analyze the detection data of nanohertz gravitational waves in an attempt to address the issue of overproduction of primordial black holes. Furthermore, we propose that the angular power spectrum, which characterizes the anisotropy of scalar-induced gravitational waves, can serve as a powerful probe of primordial non-Gaussianity. We will also introduce the stochastic gravitational-wave background produced by binary black hole mergers and discuss its angular power spectrum to distinguish this astrophysical source from the scalar-induced gravitational waves. We anticipate that gravitational wave probes will play a significant role in the study of primordial black holes and the origin of the universe.
报告人介绍：王赛，中国科学院高能物理研究所理论物理室，副研究员。2009年本科毕业于华中科技大学物理学院，2014年博士毕业于中国科学院高能物理研究所。2014至2019年先后在中国科学院理论物理研究所、香港中文大学物理系、日本高能加速器研究机构（KEK）理论中心做博士后研究，2019年回国工作。研究方向为引力波宇宙学，主要从事暗物质、宇宙起源及早期演化相关理论研究。迄今在PRL等期刊上发表60余篇论文，其中多篇论文被LIGO、LISA、NANOGrav等国际引力波探测组及诺奖得主G.F.Smoot等知名学者引用。获得中国科学院百人计划择优支持以及NSFC面上项目资助。
