Mathematics – Logic
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21531303c&link_type=abstract
American Astronomical Society, AAS Meeting #215, #313.03; Bulletin of the American Astronomical Society, Vol. 42, p.313
Mathematics
Logic
Scientific paper
Gravitationally lensed quasars will provide future dark energy surveys with an additional and independent cosmological probe "for free". Current constraints from 10-16 lensed quasars with measured time delays already yield the Hubble constant (h) in agreement with and to roughly the same level of precision (10%) as the HST Key Project which analyzed 40 Cepheids. Future surveys (Pan-STARRS, LSST, JDEM / IDECS, SKA, OMEGA) will yield hundreds or even thousands of lenses with well-measured time delays. We find in a flat universe with constant w including a Planck prior, LSST time delay measurements for 4,000 lenses should constrain h to 0.007 ( 1%), Omegade to 0.005, and w to 0.026 (all 1-sigma precisions). Similar constraints could be obtained by a dedicated space-based gravitational lens observatory (OMEGA) which would obtain precise time delay and mass model measurements for 100 lenses with spectroscopic redshifts. Constraints for a general cosmology are presented as well. We compare these to the "optimistic Stage IV" constraints expected from weak lensing, supernovae, baryon acoustic oscillations, and cluster counts, as calculated by the Dark Energy Task Force. As with any method, there are systematics we must learn to control, and we discuss these issues. This work was carried out at Jet Propulsion Laboratory, California Institute of Technology, under a contract with NASA.
Coe Dan A.
Moustakas Leonidas
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