HAL : in2p3-00022109, version 1

arXiv : astro-ph/0403285

DOI : 10.1103/PhysRevD.70.043514

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Physical Review D 70 (2004) 043514

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

J.-M. Virey 1, P. Taxil 1, A. Tilquin 2, A. Ealet 2, D. Fouchez 2, C. Tao 2

(2004)

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.

1 :	Centre de Physique Théorique (CPT)
	CNRS : FR2291 – Université de Provence - Aix-Marseille I – Université de la Méditerranée - Aix-Marseille II – Université Sud Toulon Var
2 :	Centre de Physique des Particules de Marseille (CPPM)
	CNRS : UMR7346 – IN2P3 – Université de la Méditerranée - Aix-Marseille II

Thème(s)

:

Physique/Astrophysique/Cosmologie et astrophysique extra-galactique Planète et Univers/Astrophysique

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Contributeur : Magali Damoiseaux <>

Soumis le : Vendredi 16 Juillet 2004, 16:56:04

Dernière modification le : Mardi 31 Octobre 2006, 17:17:41