Four LSST probes of Dark Energy

Details Four LSST probes of Dark Energy Four LSST probes of Dark Energy

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.8608t&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #86.08; Bulletin of the American Astronomical Society, V

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The physics that produces the observed accelerating cosmic expansion is unknown. The half-sky LSST multi-band survey will address the underlying dark energy physics by exploiting a diversity of precision cosmic probes:

• Weak lensing (WL) of galaxies vs. redshift, which probes both distances and the evolution of structure vs. redshift, thereby setting multiple independent strong constraints on the dark energy equation of state (EOS).
• Spatial correlations of galaxies vs. redshift (Baryon Acoustic Oscillations, BAO) 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 an exponentially sensitive probe of the dark energy EOS.
• A million 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. By simultaneously measuring the distance-redshift and growth-redshift relations, LSST data can tell us whether the recent acceleration is due to dark energy or modified gravity. 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. The diverse techniques above are complementary, removing degeneracies. Much of the power of the LSST comes from the fact that the measurements will be obtained from the same set of observations with a powerful facility optimized for this purpose. Using realistic estimates of systematics from LSST-like observing on the Subaru telescope, we will show projected precision of the LSST survey constraints on the nature of dark energy.

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