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Probing Dark Energy with Supernovae : Bias from the time evolution of the equation of state

Abstract : Observation of thousands of type Ia supernovae should offer the most direct approach to probe the dark energy content of the Universe. This will be undertaken by future large ground-based surveys followed by a space mission (SNAP/JDEM). We address the problem of extracting the cosmological parameters from future data in a model independent approach, with minimal assumptions on the prior knowledge of some parameters. We concentrate on the comparison between a fiducial model and the fitting function and address in particular the effect of neglecting (or not) the time evolution of the equation of state. We present a quantitative analysis of the bias that can be introduced by the fitting procedure. Such a bias cannot be ignored as soon as the statistical errors from present data are drastically improved.
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http://hal.in2p3.fr/in2p3-00022109
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Submitted on : Friday, July 16, 2004 - 4:56:04 PM
Last modification on : Tuesday, October 19, 2021 - 10:59:13 PM

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J.-M. Virey, P. Taxil, A. Tilquin, A. Ealet, D. Fouchez, et al.. Probing Dark Energy with Supernovae : Bias from the time evolution of the equation of state. Physical Review D, American Physical Society, 2004, 70, pp.043514. ⟨10.1103/PhysRevD.70.043514⟩. ⟨in2p3-00022109⟩

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