Multiple Probes Of Dark Energy With LSST

Details Multiple Probes Of Dark Energy With LSST Multiple Probes Of Dark Energy With LSST

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21346005t&link_type=abstract

American Astronomical Society, AAS Meeting #213, #460.05; Bulletin of the American Astronomical Society, Vol. 41, p.367

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The 27.6 magnitude limit of the LSST image stack enables photometry of ten billion galaxies to low surface brightness and shape measurement of several billion galaxies. A number of independent cross checking probes of the nature of dark energy will result. Using many photometric redshift bins, the joint analysis of 2-D baryon acoustic oscillations (BAO) and weak lensing (WL) is particularly powerful. The half-sky LSST six band survey will address dark energy physics by exploiting a diversity of simultaneous precision probes:
-WL of galaxies vs. redshift, which probes both distances and the evolution of structure vs. redshift, setting multiple independent constraints on dark energy.
-Spatial correlations of galaxies (BAO) vs. redshift utilizes the "standard ruler" of the peak in the correlation of dark matter revealed in the temperature anisotropies in the cosmic microwave background (CMB).
-The redshift distribution of shear peaks due to large structures of dark matter (via WL combined with the optical data) is a potentially sensitive probe of dark energy.
-Tens of thousands of supernovae are complementary for probing the recent cosmic era when dark energy becomes dominant.
When combined with the CMB data these tests form interlocking checks on cosmological models and the physics of dark energy. In addition, LSST wide angular coverage data is capable of uncovering anisotropy in dark energy. LSST is being specifically engineered to minimize and control systematics at a level ten times below the smallest signal of interest. Systematic error experiments using the Subaru telescope are incorporated. Reconstruction of galaxy images from fitting models to the full image stack can overcome residual PSF systematics. Full system simulations of LSST dark energy performance will be shown.

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