Light Bending as a Probe of the Nature of Dark Energy

Details Light Bending as a Probe of the Nature of Dark Energy Light Bending as a Probe of the Nature of Dark Energy

2006-01-03

arxiv.org/abs/astro-ph/0601044v2

Phys.Rev.D75:043003,2007

Astronomy and Astrophysics

Astrophysics

5 pages, 2 figures, 1 table. References added, final version appeared in Physical Review D

Scientific paper

10.1103/PhysRevD.75.043003

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 $\Lambda$ 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 be not negligible with respect to the Einstein prediction in lensing involving clusters of galaxies. Strong lensing may therefore be useful to distinguish $\Lambda$ from other dark energy models.

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