Astronomy and Astrophysics – Astronomy
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21441306j&link_type=abstract
American Astronomical Society, AAS Meeting #214, #413.06; Bulletin of the American Astronomical Society, Vol. 41, p.680
Astronomy and Astrophysics
Astronomy
Scientific paper
We examine the influence of percent-level dark energy corrections to the nonlinear matter power spectrum on constraints of the dark energy equation of state from future weak lensing probes. We explicitly show that a poor approximation (off by > 10%) to the nonlinear corrections causes a > 1 sigma bias on the determination of the dark energy equation of state. For the WMAP5 cosmology, the more accurate power spectrum is more sensitive to dark energy properties, resulting in a factor of two improvement in dark energy equation of state constraints. We further explore the complementary constraints on dark energy from future weak lensing and supernova surveys. While weak lensing is most powerful at intermediate redshifts, the SNe primarily help constrain the low-redshift universe. A space-based, JDEM-like survey measures the equation of state in five independent redshift bins to 10%, while this improves to 5% for a wide-field ground-based survey like LSST.
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