On the influence of the cosmological constant on gravitational lensing in small systems

Details On the influence of the cosmological constant on gravitational lensing in small systems On the influence of the cosmological constant on gravitational lensing in small systems

2007-11-12

arxiv.org/abs/0711.1802v2

Phys.Rev.D77:043004,2008

Astronomy and Astrophysics

Astrophysics

8 pages, 1 figure; v2: extended discussion on the lens equation, references added, results unchanged, in press on PRD

Scientific paper

10.1103/PhysRevD.77.043004

The cosmological constant Lambda affects gravitational lensing phenomena. The contribution of Lambda to the observable angular positions of multiple images and to their amplification and time delay is here computed through a study in the weak deflection limit of the equations of motion in the Schwarzschild-de Sitter metric. Due to Lambda the unresolved images are slightly demagnified, the radius of the Einstein ring decreases and the time delay increases. The effect is however negligible for near lenses. In the case of null cosmological constant, we provide some updated results on lensing by a Schwarzschild black hole.

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