Light bending as a probe of the nature of dark energy

F. Finelli, M. Galaverni, and A. Gruppuso
Phys. Rev. D 75, 043003 – Published 7 February 2007

Abstract

We study the bending of light for static spherically symmetric (SSS) space-times which include a dark energy contribution. Geometric dark energy models generically predict a correction to the Einstein angle written in terms of the distance to the closest approach, whereas a cosmological constant Λ does not. While dark energy is associated with a repulsive force in cosmological context, its effect on null geodesics in SSS space-times can be attractive as for the Newtonian term. This dark energy contribution may not be negligible with respect to the Einstein prediction in lensing involving clusters of galaxies. Strong lensing may therefore be useful to distinguish Λ from other dark energy models.

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  • Received 10 January 2006

DOI:https://doi.org/10.1103/PhysRevD.75.043003

©2007 American Physical Society

Authors & Affiliations

F. Finelli1,2,3, M. Galaverni1,3,4, and A. Gruppuso1,3

  • 1INAF-IASF Bologna, via Gobetti 101, I-40129 Bologna, Italy
  • 2INAF, Osservatorio Astronomico di Bologna, via Ranzani 1, I-40127 Bologna, Italy
  • 3INFN, Sezione di Bologna, via Irnerio 46, I-40126 Bologna, Italy
  • 4Dipartimento di Fisica, Università di Ferrara, via Saragat 1, I-44100 Ferrara, Italy

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Issue

Vol. 75, Iss. 4 — 15 February 2007

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