2005/06/30 by Levon Pogosian, Pier Stefano Corasaniti, Pier-Stefano Corasaniti +5 · 5 citations
Physics and Astronomy · #Acceleration #Astrophysics #Classical mechanics #Cosmic microwave background #Cosmology #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Dark energy #Equation of state #Galaxies: Formation, Evolution, Phenomena #Galaxy #Large Synoptic Survey Telescope #Optics #Parametrization (atmospheric modeling) #Physics #Planck #Quantum mechanics #Radiative transfer #Redshift #Supernova #astro-ph #hep-ph #hep-th
paper · pdf · doi:10.1103/physrevd.72.103519
published as Phys.Rev. D72 (2005) 103519 · 15 pages, 17 figures. Added discussion, references, 2 new figures. Minor errors fixed in the calculation. The predicted ISW constraints on w(z) are slightly tighter. Matches the version accepted to PRD
arxiv created 2005/10/31 · openalex publication_date 2005/11/16 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We present an analysis of the constraining power of future measurements of the integrated Sachs-Wolfe (ISW) effect on models of the equation of state of dark energy as a function of redshift, w(z). To achieve this, we employ a new parametrization of w, which utilizes the mean value of w(z) (⟨w⟩) as an explicit parameter. This helps to separate the information contained in the estimation of the distance to the last scattering surface (from the cosmic microwave background (CMB)) from the information contained in the ISW effect. We then use Fisher analysis to forecast the expected uncertainties in the measured parameters from future ISW observations for two models of dark energy with very different time evolution properties. For example, we demonstrate that the cross correlation of Planck CMB data and large synoptic survey telescope (LSST) galaxy catalogs will provide competitive constraints on w(z), compared to a supernovae acceleration probe (SNAP)-like supernovae (SNe) project, for models of dark energy with a rapidly changing equation of state (e.g. Kink models). Our work confirms that, while SNe measurements are more suitable for constraining variations in w(z) at low redshift, the ISW effect can provide important independent constraints on w(z) at high z.