Four LSST Probes of Dark Energy

Details Four LSST Probes of Dark Energy Four LSST Probes of Dark Energy

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21113705t&link_type=abstract

American Astronomical Society, AAS Meeting #211, #137.05; Bulletin of the American Astronomical Society, Vol. 39, p.979

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The half-sky LSST six band survey of four billion galaxies will address dark energy physics by exploiting a diversity of precision probes:
• Weak lensing tomography (WL) of galaxies vs. redshift, which probes both distances and the evolution of structure vs. redshift,
setting multiple independent constraints on the dark energy equation of state.
• Spatial correlations of galaxies (Baryon Acoustic Oscillations, 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) are a potentially sensitive probe of dark energy.
• Hundreds 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. The combination of BAO with WL is especially powerful. Astrophysical observations are susceptible to systematics, so the LSST is being specifically designed and 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 in these estimates. These diverse probes are complementary, removing degeneracies. The LSST measurements will be obtained from the same set of observations with a powerful facility optimized for this purpose.

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