Paper: astro-ph/0601044
Date: Tue, 3 Jan 2006 13:29:15 GMT (39kb)

Title: Light Bending as a Probe of the Nature of Dark Energy

Authors: Fabio Finelli, Matteo Galaverni, Alessandro Gruppuso

Comments: 4 pages, 2 figures, 1 table
\\
We study the bending of light for static spherically symmetric (SSS)
space-times which include a dark energy contribution. Although a cosmological
constant $\Lambda$ does not deflect light, geometric dark energy models
generically predict a correction to the Einstein angle. 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.

\\ ( http://arXiv.org/abs/astro-ph/0601044 , 39kb)