Direct reconstruction of the quintessence potential

Details Direct reconstruction of the quintessence potential Direct reconstruction of the quintessence potential

2005-06-28

arxiv.org/abs/astro-ph/0506696v1

Phys.Rev.D72:083511,2005

Astronomy and Astrophysics

Astrophysics

9 pages RevTeX4 with lots of incorporated figures

Scientific paper

10.1103/PhysRevD.72.083511

We describe an algorithm which directly determines the quintessence potential from observational data, without using an equation of state parametrisation. The strategy is to numerically determine observational quantities as a function of the expansion coefficients of the quintessence potential, which are then constrained using a likelihood approach. We further impose a model selection criterion, the Bayesian Information Criterion, to determine the appropriate level of the potential expansion. In addition to the potential parameters, the present-day quintessence field velocity is kept as a free parameter. Our investigation contains unusual model types, including a scalar field moving on a flat potential, or in an uphill direction, and is general enough to permit oscillating quintessence field models. We apply our method to the `gold' Type Ia supernovae sample of Riess et al. (2004), confirming the pure cosmological constant model as the best description of current supernovae luminosity-redshift data. Our method is optimal for extracting quintessence parameters from future data.

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