Constraints on dark energy models from radial baryon acoustic scale measurements

TL;DR

This paper uses radial BAO measurements to constrain dark energy models, finding consistency with a cosmological constant but allowing for time-varying dark energy, especially when combined with supernova data.

Contribution

It demonstrates that radial BAO data provide constraints comparable to other BAO data and enhances dark energy parameter constraints when combined with supernova observations.

Findings

Radial BAO data are consistent with a cosmological constant.

Combined BAO and supernova data yield tight dark energy constraints.

Radial BAO measurements do not exclude time-varying dark energy.

Abstract

We use the radial baryon acoustic oscillation (BAO) measurements of Gaztanaga et al. (2008) to constrain parameters of dark energy models. These constraints are comparable with constraints from other "non-radial" BAO data. The radial BAO data are consistent with the time-independent cosmological constant model but do not rule out time-varying dark energy. When we combine radial BAO and the Kowalski et al. (2008) Union type Ia supernova data we get very tight constraints on dark energy.