2012MNRAS.424.2864C -
Mon. Not. R. Astron. Soc., 424, 2864-2875 (2012/August-3)
Constraining the dark energy equation of state with double-source plane strong lenses.
COLLETT T.E., AUGER M.W., BELOKUROV V., MARSHALL P.J. and HALL A.C.
Abstract (from CDS):
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. The large area KX quasar catalogue – I. Analysis of the photometric redshift selection and the complete quasar catalogue
Abstract Copyright:
2012 The Authors Monthly Notices of the Royal Astronomical Society 2012 RAS
Journal keyword(s):
gravitational lensing: strong - cosmological parameters - dark energy
Simbad objects:
2
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