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Constraints on Dark Energy from Strong Gravitational Lensing by Galaxy Clusters

Published online by Cambridge University Press:  15 June 2005

Massimo Meneghetti
Affiliation:
ITA, Universität Heidelberg Present address: Institut für Teoretische Astrophysik, Tiergartenstr. 15, 69120 Heidelberg, Germany
Carlo Baccigalupi
Affiliation:
SISSA, Trieste
Matthias Bartelmann
Affiliation:
ITA, Universität Heidelberg
Klaus Dolag
Affiliation:
Dipartimento di Astronomia, Università di Padova
Lauro Moscardini
Affiliation:
Dipartimento di Astronomia, Università di Bologna
Francesca Perrotta
Affiliation:
SISSA, Trieste
Giuseppe Tormen
Affiliation:
Dipartimento di Astronomia, Università di Padova
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Abstract

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We discuss two methods for constraining the equation of state of dark energy using strong gravitational lensing by galaxy clusters. In the so called “arc statistics” approach, we compare the cluster efficiency for producing giant arcs in several dark-energy cosmologies and in the “standard” $\Lambda$CDM and OCDM models. We find that the expected abundance of gravitational arcs depends on the equation of state of dark energy and reflects the dependence of halo concentrations on cosmology. In agreement with results in previous works, the lensing cross section is very sensitive to dynamical processes occurring in the lenses. Then we use gravitational arcs for tracing the position of the lens critical curves and we measure their scaling with the source redshift in a variety of cosmological models. We find that there is a degeneracy between several lens properties and the equation of state of dark energy which can be broken only after an extremely precise modeling of the lens. Instead of using this “golden lens” approach, we check whether combining the information from a statistical sample of clusters we can distinguish among the various cosmologies. We test the method on a sample of numerically simulated clusters and we reproduce the results expected from the analytic models.To search for other articles by the author(s) go to: http://adsabs.harvard.edu/abstract_service.html

Type
Contributed Papers
Copyright
© 2004 International Astronomical Union