Constraints on dark energy from the lookback time versus redshift test

TL;DR

This paper uses lookback time data from galaxies and clusters, combined with other cosmological observations, to constrain dark energy models and refine estimates of cosmological parameters.

Contribution

It introduces a method of constraining dark energy parameters using lookback time data combined with other cosmological measurements.

Findings

Lookback time data provide moderate constraints on cosmological parameters.

Combining lookback time with BAO and supernova data tightens parameter constraints.

Results favor slightly smaller matter density values.

Abstract

We use lookback time versus redshift data from galaxy clusters (Capozziello et al., 2004) and passively evolving galaxies (Simon et al., 2005), and apply a bayesian prior on the total age of the Universe based on WMAP measurements, to constrain dark energy cosmological model parameters. Current lookback time data provide interesting and moderately restrictive constraints on cosmological parameters. When used jointly with current baryon acoustic peak and Type Ia supernovae apparent magnitude versus redshift data, lookback time data tighten the constraints on parameters and favor slightly smaller values of the nonrelativistic matter energy density.