标题： 通过强引力透镜双黑洞合并测量引力波的偏振内容 显示英文标题

标题： Measuring the polarization content of gravitational waves with strongly lensed binary black hole mergers

摘要： 替代引力理论预测引力波有最多六种不同的极化模式。 强引力透镜效应使我们能够通过有效增加来自同一天体物理源的观测数量来探测这些信号的极化内容。 由于多个观测到的透镜图像的时间延迟以及地球的自转，可以相对于源位置定义有效的非共位干涉仪，从而通过更多观测探测替代极化振幅。 为了测量这些振幅，我们将图像观测与一个考虑图像放大率、时间延迟和极化模式振幅的单一引力波信号模型进行联合拟合。 我们表明，在某些系统中，我们可以对具有两个可检测图像的透镜事件测量相对模式振幅。 显示英文摘要

摘要： 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.