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

Thomas E. Collett, Matthew W. Auger, Vasily Belokurov, Philip J. Marshall, Alex C. Hall

Research output: Contribution to journalArticlepeer-review


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 CASSOWARY or from a spectroscopically selected catalogue such as SLACS. We find that constraints comparable to current data-sets (15% uncertainty on the dark equation of state at 68%CL) are possible with a handful of double source plane systems. We also find that the method's degeneracy between Omega_M and w is almost orthogonal to that of CMB and BAO measurements, making this method highly complimentary to current probes.
Original languageEnglish
Pages (from-to)2864-2875
Number of pages12
JournalMonthly Notices of the Royal Astronomical Society
Issue number4
Publication statusPublished - 21 Aug 2012


  • astro-ph.CO
  • gr-qc


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