主讲人单位 (Speaker's Institute): 约翰霍普金斯大学

邀请人 (Invited by): 张建东

时间 (Time): 星期二，2022/11/8-9:00-10:30

地点 (Location): 珠海校区天琴中心1416会议室/腾讯会议

摘要 (Abstract): 

The stochastic gravitational-wave backgrounds (SGWBs) for current detectors are dominated by binary black-hole (BBH) and binary neutron-star (BNS) coalescences. The sensitivity of current networks of gravitational-wave (GW) detectors allows only a small fraction of BBHs and BNSs to be resolved and subtracted, but previous work indicated that the situation should significantly improve with next-generation (XG) observatories. We revisit these conclusions by taking into account waveform-modeling uncertainties, updated astrophysical models, and (crucially) the full set of parameters that must be estimated to remove the resolved sources. Compared to previous studies, we find that the residual background from BBHs and BNSs is large even with XG detector networks. New data analysis methods will thus be required to observe the SGWB from cosmic supernovae or contributions from early-Universe phenomena like cosmic strings, stiff post-inflation fluids, or axion inflation.

主讲人简介 (Speaker's CV): 

周贝,2015年硕士毕业于紫金山天文台，2020年博士毕业于俄亥俄州立大学。2020年起至今，在约翰霍普金斯大学从事博士后研究工作。目前主要从事引力波、粒子天体物理和宇宙学以及暗物质相关的研究工作。