On the determination of the deceleration parameter from Supernovae data

Details On the determination of the deceleration parameter from Supernovae data On the determination of the deceleration parameter from Supernovae data

2005-02-08

arxiv.org/abs/astro-ph/0502163v1

Phys.Rev. D72 (2005) 061302

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures, submitted

Scientific paper

10.1103/PhysRevD.72.061302

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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