Journal Article

Constraining the dark energy equation of state with double-source plane strong lenses

T. E. Collett, M. W. Auger, V. Belokurov, P. J. Marshall and A. C. Hall

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 424, issue 4, pages 2864-2875
Published in print August 2012 | ISSN: 0035-8711
Published online August 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2012.21424.x
Constraining the dark energy equation of state with double-source plane strong lenses

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ABSTRACT

We investigate the possibility of constraining the dark energy equation of state by measuring the ratio of Einstein radii in a strong gravitational lens system with two source planes. This quantity is independent of the Hubble parameter and directly measures the growth of angular diameter distances as a function of redshift. We investigate the prospects for a single double-source plane system and for a forecast population of systems discovered by re-observing a population of single-source lenses already known from a photometrically selected catalogue such as Cambridge and Sloan survey of wide arcs in the sky or from a spectroscopically selected catalogue such as Sloan Lens ACS survey. We find that constraints comparable to current data sets (σ(w) ∼ 15 per cent) are possible with a handful of double-source plane systems. We also find that the method's degeneracy between ΩM and w is almost orthogonal to that of cosmic microwave background and Baryon Acoustic Oscillations measurements, making this method highly complimentary to current probes.

Keywords: gravitational lensing: strong; cosmological parameters; dark energy

Journal Article.  8104 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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