Abstract
We use lookback time versus redshift data from galaxy clusters (Capozziello et al., 2004 [9]) and passively evolving galaxies (Simon et al., 2005 [62]), 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.
Highlights
It is a well established fact that the expansion of the Universe is accelerating, but the underlying mechanism which gives rise to this cosmic acceleration is still a mystery
Recent cosmological observations including the Hubble diagram of Type Ia supernovae (SNeIa, e.g., Hicken et al, 2009; Shafieloo et al, 2009; Guimaraes et al, 2009), combined with cosmic microwave background (CMB) anisotropy measurements (e.g., Dunkley et al, 2009; Komatsu et al, 2009), baryon acoustic peak galaxy power spectrum data (e.g., Percival et al, 2007; Samushia & Ratra, 2009a; Gaztanaga et al, 2009; Wang, 2009), and galaxy cluster gas mass fraction measurements (e.g., Allen et al, 2008; Samushia & Ratra, 2008; Ettori et al, 2009) indicate that we live in a spatially-flat universe where nonrelativistic matter contributes about 30% of the critical density
In this paper we constrain the parameters of three different dark energy models
Summary
It is a well established fact that the expansion of the Universe is accelerating, but the underlying mechanism which gives rise to this cosmic acceleration is still a mystery. In this paper we use two sets of lookback time versus redshift measurements, for galaxy clusters (Capozziello et al, 2004) and for passively evolving galaxies (Simon et al, 2005), and apply a bayesian prior on the total age of the Universe based on WMAP estimates (Dunkley et al, 2009), to constrain parameters of these dark energy models. This time-based cosmological test differs from other widely-used distance-based cosmological tests..
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