Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-10-25
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.
Allison Chris
Dossett Jason
Ishak Mustapha
Moldenhauer Jacob
Rindler Wolfgang
No associations
LandOfFree
A New Independent Limit on the Cosmological Constant/Dark Energy from the Relativistic Bending of Light by Galaxies and Clusters of Galaxies does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with A New Independent Limit on the Cosmological Constant/Dark Energy from the Relativistic Bending of Light by Galaxies and Clusters of Galaxies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A New Independent Limit on the Cosmological Constant/Dark Energy from the Relativistic Bending of Light by Galaxies and Clusters of Galaxies will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-432197