Other
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21346006f&link_type=abstract
American Astronomical Society, AAS Meeting #213, #460.06; Bulletin of the American Astronomical Society, Vol. 41, p.367
Other
Scientific paper
Tomographic shear-shear correlations (derived from a weak lensing survey and restricted to large scales) and the number counts of shear-selected galaxy clusters (identified in the same weak-lensing survey, and sensitive primarily to density fluctuations on small scales) can be combined to constrain dark energy properties. We show that the covariance between these two observables is small, and therefore they can be regarded as almost independent constraints. We find that when the number counts and the shear-shear correlations (on angular scales l < 1000) are combined, the LSST (Large Synoptic Survey Telescope) survey can yield statistical errors on (Omega_DE, w_0, w_a) that are a factor of (25,2,11) better than the counts-alone, and a factor of (3,2,3) better than the WL shear-alone results. WL shear can be combined with other observables, but we expect number counts should be generically useful even when added to such combined datasets. This is because the number count constraints arise from a unique combination of the cosmology-dependence of structure growth and comoving volume -- this dependence is different, for example, from observables probing geometrical distances, such as baryon acoustic oscillations (BAO) or Type Ia supernovae (SNe).
Fang Wenjuan
Haiman Zoltan
LSST Weak Lensing Collaboration
May Martin
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