主讲人单位 (Speaker's Institute): 北京师范大学

邀请人 (Invited by): 张建东

时间 (Time): 星期三,2022/06/15-15:00 to 16:30

地点 (Location): 珠海校区天琴中心1416会议室

摘要 (Abstract): 

Gravitational waves (GWs) from compact binary coalescences provide an independent probe of the cosmic expansion history other than electromagnetic waves. In this work, we assume the binary black holes (BBHs) detected by LIGO-Virgo-KAGRA (LVK) collaborations are of primordial origin and constrain the population parameters of primordial black holes (PBHs) and Hubble parameter H(z) using 42 BBHs from third LVK GW transient catalog (GWTC-3). Three PBH mass models are considered: lognormal, power-law, and critical collapse PBH mass functions. By performing a hierarchical Bayesian population analysis, the Bayes factor strongly disfavors the power-law PBH mass function against the other two in GWTC-3. The constraints on standard ΛCDM cosmological parameters are rather weak and in agreement with current results. When combining the multi-messenger standard siren measurement from GW170817, the Hubble constant H₀ is constrained to be 69_-8⁺¹⁹km s^-1Mpc^-1 and 70_-8⁺²⁹km s^-1Mpc^-1 at 68% confidence for the lognormal and critical collapse mass models, respectively. Our results are comparable with those assuming the phenomenological mass models inspired by the astrophysical black hole scenario.

主讲人简介 (Speaker's CV): 

陈祖成，2021年博士毕业于中国科学院理论物理研究所，现为北京师范大学博士后。曾经是LIGO引力波科学合作组成员，现为PPTA和IPTA脉冲星计时阵合作组成员。主要从事引力波和宇宙学方向的研究，在Phys.Rev.Lett.等期刊发表16余篇学术论文。