Multipole decomposition of gravitational lensing

@inproceedings{Turyshev2021MultipoleDO,
  title={Multipole decomposition of gravitational lensing},
  author={Slava G. Turyshev and V. Toth},
  year={2021}
}
We study gravitational lensing by a generic extended mass distribution. For that, we consider the diffraction of electromagnetic (EM) waves by an extended, weakly aspherical, gravitating object. We account for the static gravitational field of such a lens by representing its exterior potential in the most generic form, expressed via an infinite set of symmetric trace free (STF) tensor multipole mass moments. This yields the most general form of the gravitational phase shift, which allows for a… 

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