Lensing by Kerr Black Holes. I: General Lens Equation and Magnification Formula

Details Lensing by Kerr Black Holes. I: General Lens Equation and Magnification Formula Lensing by Kerr Black Holes. I: General Lens Equation and Magnification Formula

2011-02-21

arxiv.org/abs/1102.4300v2

J. Math. Phys. 52, 092502 (2011)

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

11 pages; final published version

Scientific paper

We develop a unified, analytic framework for gravitational lensing by Kerr black holes. In this first paper we present a new, general lens equation and magnification formula governing lensing by a compact object. Our lens equation assumes that the source and observer are in the asymptotically flat region and does not require a small angle approximation. Furthermore, it takes into account the displacement that occurs when the light ray's tangent lines at the source and observer do not meet on the lens plane. We then explore our lens equation in the case when the compact object is a Kerr black hole. Specifically, we give an explicit expression for the displacement when the observer is in the equatorial plane of the Kerr black hole as well as for the case of spherical symmetry.

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