论文标题
用强透明的二进制黑洞合并测量重力波的极化含量
Measuring the polarization content of gravitational waves with strongly lensed binary black hole mergers
论文作者
论文摘要
重力的替代理论可预测重力波最多六种不同的极化模式。引力波的强重力透镜使我们能够通过有效增加来自同一天体物理源的观测值来探测这些信号的极化含量。镜头时间延迟由于多个观察到的镜头图像与地球旋转相结合，可以根据源位置定义有效的非集中干涉仪，并因此探测了更多观察结果的替代极化幅度。为了测量这些幅度，我们将图像观测值共同拟合到单个引力波信号模型，该模型考虑了图像的增值，时间延迟和极化模式幅度。我们表明，对于某些系统，我们可以测量具有两个可检测图像的镜头事件的相对模式振幅。
Alternative theories of gravity predict up to six distinct polarization modes for gravitational waves. Strong gravitational lensing of gravitational waves allows us to probe the polarization content of these signals by effectively increasing the number of observations from the same astrophysical source. The lensing time delays due to the multiple observed lensed images combined with the rotation of the Earth allows for effective non-collocated interferometers to be defined with respect to the source location and hence probe the alternative polarization amplitudes with more observations. To measure these amplitudes, we jointly fit the image observations to a single gravitational wave signal model that takes into account the image magnifications, time delays, and polarization mode amplitudes. We show that for certain systems, we can make a measurement of the relative mode amplitudes for lensed events with two detectable images.
