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Article Dans Une Revue Physical Review D Année : 2005

On the determination of the deceleration parameter from Supernovae data

Résumé

Supernovae searches have shown that a simple matter-dominated and decelerating universe should be ruled out. However a determination of the present deceleration parameter $q_0$ through a simple kinematical description is not exempt of possible drawbacks. We show that, with a time dependent equation of state for the dark energy, a bias is present for $q_0$ : models which are very far from the so-called Concordance Model can be accommodated by the data and a simple kinematical analysis can lead to wrong conclusions. We present a quantitative treatment of this bias and we present our conclusions when a possible dynamical dark energy is taken into account.
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Dates et versions

hal-00005100 , version 1 (23-11-2023)

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J. -M. Virey, P. Taxil, A. Tilquin, A. Ealet, C. Tao, et al.. On the determination of the deceleration parameter from Supernovae data. Physical Review D, 2005, 72, pp.061302. ⟨10.1103/PhysRevD.72.061302⟩. ⟨hal-00005100⟩
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