Abstract
The cosmological constant affects gravitational lensing phenomena. The contribution of to the observable angular positions of multiple images and to their amplification and time delay is here computed through a study of the weak deflection limit of the equations of motion in the Schwarzschild–de Sitter metric. Because of 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 a null cosmological constant, we provide some updated results on lensing by a Schwarzschild black hole.
- Received 12 November 2007
DOI:https://doi.org/10.1103/PhysRevD.77.043004
©2008 American Physical Society