The Relevance of the Cosmological Constant for Lensing

TL;DR

This review discusses recent findings on how the cosmological constant influences light bending in gravitational lensing, highlighting that its effect is now well established but integrating it into cosmological models needs further clarification.

Contribution

It summarizes recent developments on the impact of the cosmological constant on light bending and discusses the challenges of incorporating this effect into cosmological lensing models.

Findings

The effect of the cosmological constant on light bending is well established.

Incorporating $mbda$ into cosmological lensing models remains complex.

Further work is needed to clarify $mbda$'s role in cosmological settings.

Abstract

This review surveys some recent developments concerning the effect of the cosmological constant on the bending of light by a spherical mass in Kottler (Schwarzchild-de Sitter) spacetime. Some proposals of how such an effect may be put into a setting of gravitational lensing in cosmology are also discussed. The picture that emerges from this review is that it seems fair to assert that the contribution of $\Lambda$ to the bending of light has by now been well established, while putting the $\Lambda$ light-bending terms into a cosmological context is still subject to some interpretation and requires further work and clarification.