标题： 通过脉冲星的引力透镜效应测量黑洞自旋 显示英文标题

标题： Measuring black hole spin through gravitational lensing of pulsars

摘要： 我们提出了一种基于毫秒脉冲星引力透镜的新方法，可以空前精确地测量黑洞自旋。 随着旋转参数的增加，光偏转角也会增大。 对于主像和次像，旋转黑洞的角位置比非旋转黑洞大微角秒量级。 此外，对于旋转黑洞的情况，时间差分延迟比非旋转情况下的大，并且这种差异可能达到几秒钟。 我们表明，该量可以帮助我们实现对黑洞自旋的极其精确的测量，比目前和近未来的其他方法估算的黑洞自旋精度高得多。 显示英文摘要

摘要： We put forward a new procedure for measuring the spin of a black hole with unprecedented accuracy based on gravitational lensing of millisecond pulsars. The deflection angle of light increases by increasing the rotation parameter. For primary and secondary images the angular positions are larger for rotating black holes by an amount of the order of microarcseconds. Also, the differential time delay for the case of a rotating black hole is larger than that for the non-rotating case and the difference could be as large as a few seconds. We show that this quantity could help us achieve an extremely precise measurement of the black hole spin, much more accurate than the current and near future achievable estimation of black hole spin through other methods.