2009/04/30 by Shahab Joudaki, Asantha Cooray, D. E. Holz +1 · 1 citation
Physics and Astronomy · #Astrophysics #Cosmology #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Dark energy #Dark fluid #Dark matter #Energy (signal processing) #Equation of state #Galaxies: Formation, Evolution, Phenomena #Galaxy #Matter power spectrum #Physics #Quantum mechanics #Redshift #Scalar field dark matter #Spectral density #Statistics #Weak gravitational lensing #astro-ph.CO
paper · pdf · doi:10.1103/physrevd.80.023003
published as Phys.Rev.D80:023003,2009 · 12 pages, 12 figures. Typo in Eqn 8 corrected
openalex publication_date 2009/07/08 · arxiv created 2010/01/25 · arxiv updated 2010/04/28 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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 \ensuremath\gtrsim10%) to the nonlinear corrections causes a \ensuremath\gtrsim1\ensuremathσ bias on the determination of the dark energy equation of state. Future weak lensing surveys must therefore incorporate dark energy modifications to the nonlinear matter power spectrum accurate to the percent-level, to avoid introducing significant bias in their measurements. For the WMAP5 cosmology, the more accurate power spectrum is more sensitive to dark energy properties, resulting in a factor of 2 improvement in dark energy equation of state constraints. We explore the complementary constraints on dark energy from future weak lensing and supernova surveys. A space-based, Joint Dark Energy Mission-like survey measures the equation of state in five independent redshift bins to \ensuremath∼10%, while this improves to \ensuremath∼5% for a wide-field ground-based survey like the Large Synoptic Survey Telescope. These constraints are contingent upon our ability to control weak lensing systematic uncertainties to the sub-percent level.