Can we see a rotating gravitational lens?

Details Can we see a rotating gravitational lens? Can we see a rotating gravitational lens?

2000-06-12

arxiv.org/abs/astro-ph/0006157v1

Prog.Theor.Phys. 104 (2000) 95-102

Astronomy and Astrophysics

Astrophysics

8 pages (PTPTeX); accepted for publication in Prog. Theor. Phys

Scientific paper

10.1143/PTP.104.95

It is known that the rotation of a gravitational lens affects properties of images. We consider an inverse problem: If the lens is dark, can we infer its rotation from the observed images? We find that, up to the first order in the gravitational constant G, a rotating lens is not distinguishable from a non-rotating one. The quadrupole contribution to the deflection angle is also calculated for a general, extended lens object.

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