A New Type of Multi-band Gravitational Wave Sources from Galaxy Centers

主讲人 (Speaker): 

陈弦

主讲人单位 (Speaker's Institute): 

北京大学

邀请人 (Invited by): 

申荣锋

时间 (Time): 

星期三, 2019/04/10 - 15:00 to 16:00

地点 (Location): 

珠海校区海滨红楼17栋107 (Rm 107, Red House 17)

摘要 (Abstract): 

        It is known that massive black holes (MBHs) could capture small compact objects to form extreme-mass-ratio inspirals (EMRIs). Such systems emit gravitational waves (GWs) in the band of the Laser Interferometer Space Antenna (LISA) and are ideal probes of the space-time geometry of MBHs. In this talk, I will show that MBHs could also capture stellar-mass binary black holes to form binary-EMRIs (b-EMRIs) and, interestingly, a large fraction of the binaries coalesce due to the tidal perturbation by the MBHs. The coalescence could be detected by LISA as glitches in EMRI signals. Based on these results, I propose an experiment to use the multi-band (100 and 0.001 Hz) glitch signals to test gravity theories. Our simulations suggest that the experiment could measure the mass and linear momentum lost via GW radiation, as well as constrain the mass of gravitons, to a precision that is one order of magnitude better than the current limit.

主讲人简介 (Speaker's CV): 

2016-present Assistant Professor, Peking University ;2015-2016 Postdoc at the Pontificia Universidad Catolica, Chile ;2012-2014 Postdoc at the Max-Planck Institute for Gravitational Physics, Germany ;2010-2012 Postdoc at KIAA-Peking University ;2010 PhD in Astrophysics from Peking University