A note on gravitational wave lensing

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Abstract

In a recent paper (Ruffa 1999) it was proposed that the massive black hole at the Galactic center may act as a gravitational lens focusing gravitational wave energy to the Earth. Considering the gravitational wave signal emitted by galactic spinning pulsars, an enhancement in the gravitational wave intensity by a factor of a few thousand is found. For galactic and extra-galactic sources the intensity enhancement can be as high as 4000 and 17000, respectively. In this note we consider the probability of significant signal enhancement from galactic and extra-galactic pulsars by the proposed mechanism and find that it is actually negligible. The lensing effect due to a possible companion object (a star or the galactic center black hole) of the gravitational wave source is also investigated in the framework of the classical microlensing theory.

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De Paolis, F., Ingrosso, G., Nucita, A. A., & Qadir, A. (2002). A note on gravitational wave lensing. Astronomy and Astrophysics, 394(2), 749–752. https://doi.org/10.1051/0004-6361:20021258

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