Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2011-05-25
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
accepted in MNRAS, some corrections included
Scientific paper
In this work we introduce two new polynomial parametrizations of dark energy and explore their correlation properties. The parameters to fit are the equation of state values at z=0 and z=0.5, which have naturally low correlation and have already been shown to improve the popular Chevallier-Polarski-Linder (CPL) parametrization. We test our models with low redshift astronomical probes: type Ia supernovae and baryon acoustic oscillations (BAO), in the form of both current and synthetic data. Specifically, we present simulations of measurements of the radial and transversal BAO scales similar to those expected in a BAO high precision spectroscopic redshift survey similar to EUCLID. According to the Bayesian deviance information criterion (DIC), which penalizes large errors and correlations, we show that our models perform better than the CPL re-parametrization proposed by Wang (in terms of z=0 and z=0.5). This is due to the combination of a lower correlation and smaller relative errors. The same holds for a frequentist perspective: our Figure-of-Merit is larger for our parametrizations.
Lazkoz Ruth
Sendra Irene
No associations
LandOfFree
SN and BAO constraints on (new) polynomial dark energy parametrizations: current results and forecasts does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with SN and BAO constraints on (new) polynomial dark energy parametrizations: current results and forecasts, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and SN and BAO constraints on (new) polynomial dark energy parametrizations: current results and forecasts will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-190930