学术活动

引力波的首次直接探测开启了一个全新的天文学时代：引力波天文学时代。本次报告我将介绍高频引力波数据处理方法如何回答引力波信号特别是双致密星信号的搜索、参数估计以及置信度估计等问题，同时介绍针对不同引力波源的高频引力波数据处理方法。我还将简介贝叶斯多信使天文学框架以及引力波-电磁波联合数据处理方法。

The recent LIGO-Virgo detection of gravitational waves from a binary neutron star merger event GW170817 and discoveries of its accompanying electromagnetic signals marked a new era for multi-messenger astronomy. In the coming years, advanced gravitational-wave detectors are likely to detect tens to hundreds of similar events. Neutron stars in binaries can possess significant spin, which is imprinted on the gravitational waveform via the effective spin parameter. We develop a fiducial model, informed by radio observations, in order to predict the effective spin of merging binaries like GW170817. We explore the astrophysical inferences made possible by gravitational-wave measurements of spin. First, using our fiducial model, we predict that around 15-40% of binary neutron stars should have non-negligible spins assuming the spin axis of the recycled neutron star aligns with total orbital angular momentum of the binary. Second, a population for which the recycled neutron star spinning at a few milliseconds periods can be distinguished from more typical systems after 10 detections. Third, with more than 50 detections, we can confidently tell whether or not the spin axis of the recycled neutron star tends to be aligned with the binary orbit. Finally, stringent constraints can be placed on neutron star magnetic field decay after 200 detections.