A New Independent Limit on the Cosmological Constant/Dark Energy from the Relativistic Bending of Light by Galaxies and Clusters of Galaxies

Details A New Independent Limit on the Cosmological Constant/Dark Energy from the Relativistic Bending of Light by Galaxies and Clusters of Galaxies A New Independent Limit on the Cosmological Constant/Dark Energy from the Relativistic Bending of Light by Galaxies and Clusters of Galaxies

2007-10-25

arxiv.org/abs/0710.4726v3

MNRAS 388, 1279-1283 (2008)

Astronomy and Astrophysics

Astrophysics

5 pages, 1 figure, matches version published in MNRAS

Scientific paper

10.1111/j.1365-2966.2008.13468.x

We derive new limits on the value of the cosmological constant, $\Lambda$, based on the Einstein bending of light by systems where the lens is a distant galaxy or a cluster of galaxies. We use an amended lens equation in which the contribution of $\Lambda$ to the Einstein deflection angle is taken into account and use observations of Einstein radii around several lens systems. We use in our calculations a Schwarzschild-de Sitter vacuole exactly matched into a Friedmann-Robertson-Walker background and show that a $\Lambda$-contribution term appears in the deflection angle within the lens equation. We find that the contribution of the $\Lambda$-term to the bending angle is larger than the second-order term for many lens systems. Using these observations of bending angles, we derive new limits on the value of $\Lambda$. These limits constitute the best observational upper bound on $\Lambda$ after cosmological constraints and are only two orders of magnitude away from the value determined by those cosmological constraints.

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