LSST as a precision probe of dark energy

Details LSST as a precision probe of dark energy LSST as a precision probe of dark energy

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..apr.y6004t&link_type=abstract

American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As

Astronomy and Astrophysics

Astrophysics

Scientific paper

The distortion of images of high-redshift background galaxies can be used to probe the intervening mass distribution. This weak gravitational lens effect can be used to detect clusters of dark matter, weigh them, image their mass distribution, and determine their 3-D location. The number of mass clusters detected and their redshift distribution are very sensitive to the density of matter Ωm and the equation of state of dark energy w. The degeneracy curve in the Ωm -- w plane is nearly orthogonal to that from the CMB measurements, so that a combination of CMB data with weak lensing by clusters can yield precision measurements of Ωm and w, independently of the supernova observations. The planned Large Synoptic Survey Telescope (LSST) will repeatedly survey 14,000 square degrees of the sky to unprecedented depths. LSST will create a 3-D mass tomographic assay of mass overdensities back to half the age of the universe by measuring the weak gravitational shear and color-redshift of billions of high redshift galaxies. LSST measurements of shear versus source redshift and lens redshift constrain the dark energy density and equation of state. By simultaneously measuring a range of properties of cosmic shear and cluster abundance, the LSST is able to provide a number of independent constraints on the dark energy density and the equation of state. LSST will determine the dark energy equation of state w to within one percent, sharply constraining the nature of dark energy. See the web site http://lssto.org for plots.

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