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arXiv 0908.0186gr-qc
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利用引力波的引力透镜测量源-透镜-观测者系统的相对横向速度

A method to measure a relative transverse velocity of source-lens-observer system using gravitational lensing of gravitational waves

Yousuke Itoh, Toshifumi Futamase, Makoto Hattori

摘要:

在几何光学近似下,引力波像光线一样沿着零测地线传播,并且它们可能有机会受到干扰物体的引力透镜的影响,就像电磁波的情况一样。引力波的长波长和可能的源的紧凑性使我们能够从透镜图像之间的干涉中提取信息。指出干涉项中包含了源-透镜-观测者系统的相对横向速度信息,这些信息可以通过未来可能的星载引力波探测器(如BBO/DECIGO)获得。

英文摘要:

Gravitational waves propagate along null geodesics like light rays in the geometrical optics approximation, and they may have a chance to suffer from gravitational lensing by intervening objects, as is the case for electromagnetic waves. Long wavelength of gravitational waves and compactness of possible sources may enable us to extract information in the interference among the lensed images. We point out that the interference term contains information of relative transverse velocity of the source-lens-observer system, which may be obtained by possible future space-borne gravitational wave detectors such as BBO/DECIGO.

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