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Article Dans Une Revue Physical Review D Année : 2005

Tracking dark energy with the integrated Sachs-Wolfe effect: Short and long-term predictions

Levon Pogosian
  • Fonction : Auteur
Christian Stephan-Otto
  • Fonction : Auteur
Robert Crittenden
  • Fonction : Auteur
Robert Nichol
  • Fonction : Auteur

Résumé

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 parameterization of w, which utilizes the mean value of w(z) () as an explicit parameter. This helps to separate the information contained in the estimation of the distance to the last scattering surface (from the 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 LSST galaxy catalogs will provide competitive constraints on w(z), compared to a SNAP-like 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.
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Dates et versions

hal-02485262 , version 1 (20-02-2020)

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Levon Pogosian, Pier Stefano Corasaniti, Christian Stephan-Otto, Robert Crittenden, Robert Nichol. Tracking dark energy with the integrated Sachs-Wolfe effect: Short and long-term predictions. Physical Review D, 2005, 72 (10), ⟨10.1103/PhysRevD.72.103519⟩. ⟨hal-02485262⟩
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