Influence of the cosmological constant on gravitational lensing in small systems

Mauro Sereno
Phys. Rev. D 77, 043004 – Published 15 February 2008

Abstract

The cosmological constant Λ affects gravitational lensing phenomena. The contribution of Λ 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 Λ 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.

  • Figure
  • Received 12 November 2007

DOI:https://doi.org/10.1103/PhysRevD.77.043004

©2008 American Physical Society

Authors & Affiliations

Mauro Sereno*

  • Institut für Theoretische Physik, Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland

  • *sereno@physik.unizh.ch

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Vol. 77, Iss. 4 — 15 February 2008

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