报告人：朱良贵博士（北京大学）

题 目: A potential bias in GW cosmology and the role of galaxy and AGN surveys for GW cosmology

时 间：2024年1月23日（周二）下午15:00

地 点：理工楼1226

腾讯ID：125 593 708

邀请人：张玉鹏

报告摘要:

Gravitational-wave (GW) detections allow observers to directly measure the luminosity distances of GW sources without the calibration of the cosmic distance ladder, and can therefore be used as standard sirens to infer the cosmic expansion. Both the currently running GW detectors and future GW detection programs list the probe of the cosmic expansion using GW standard sirens as one of their main scientific goals. However, the published GW events detected by LIGO&Virgo&KAGRA suggest that our understanding of the population properties of GW sources is not sufficiently accurate, and that the complex spatial environments where GW sources are located can bias our parameter estimations of GW sources, then cause a bias in cosmological inference.

This talk will introduce the effect of the bias in the parameter estimations of GW sources on the cosmological inference, and how AGN surveys can be used to infer the formation environments of GW sources in order to help us determine the needfor GW waveform modeling as well as more reasonably weight the large number of candidate host galaxies for dark sirens.

报告人简介：

朱良贵(Liang-Gui Zhu), postdoctor and Boya fellow at Peking University. I got my Ph.D. degree in Theoretical Physics from Sun Yat-sen University in 2022. My research interest is GW cosmology and related GW astrophysics.