Shanghai Astronomical Observatory Astrophysics Colloquium

Title：Strong evidence for the gravitational-waves background from interfering sources in NANOGrav 15-year data set

Speaker：黄庆国（中国科学院理论物理研究所）

Time：3:00 pm Nov. 28th (Thursday)

Tencent Meeting：42915400486 password: 6360

Location: Lecture Hall, 3rd floor

Abstract：

The gravitational-wave background (GWB) in the nHz is usually believed to originate from supermassive black holes binaries (SMBHBs) in the universe. For a long time, the recognition of the Hellings-Downs (HD) curve has been considered as a smoking-gun for the detection of GWB by Pulsar Timing Arrays. However, gravitational waves from different SMBHBs can interfere with each other, causing the spatial correlation to deviate from the HD curve. In an optimistic estimation, our results indicate  the optimal statistic signal-to-noise ratio becomes 6.6 +/- 1.7 in evidence for detecting a GWB through incorporating interference in NANOGrav 15-year data set. CV：

黄庆国，中国科学院理论物理研究所研究员,中国科学院大学岗位教授，国科大杭州高等研究院双聘教授，入选国家万人计划领军人才。2000年毕业于中国科学技术大学，获学士学位；2004年于中国科学院理论物理研究所获博士学位。随后在中科院理论交叉研究中心和韩国高等研究院从事博士后研究。2010年入选中科院百人计划到理论物理所工作。目前主要从事引力和宇宙学方向的研究，在Phys.Rev.Lett.等期刊发表150余篇学术论文，被引用6700余次。

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