Observational constraint on dynamical evolution of dark energy

We use the Constitution supernova, the baryon acoustic oscillation, the cosmic microwave background, and the Hubble parameter data to analyze the evolution property of dark energy. We obtain different results when we fit different baryon acoustic oscillation data combined with the Constitution super...

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Published in:arXiv.org 2010-01
Main Authors: Gong, Yungui, Rong-Gen Cai, Chen, Yun, Zong-Hong, Zhu
Format: Article
Language:English
Subjects:
Baryons
Big Bang theory
Constitution
Cosmic microwave background
Dark energy
Equations of state
Mathematical models
Parameterization
Parameters
Red shift
Stellar evolution
Supernovae
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Rong-Gen Cai
Chen, Yun
Zong-Hong, Zhu
description We use the Constitution supernova, the baryon acoustic oscillation, the cosmic microwave background, and the Hubble parameter data to analyze the evolution property of dark energy. We obtain different results when we fit different baryon acoustic oscillation data combined with the Constitution supernova data to the Chevallier-Polarski-Linder model. We find that the difference stems from the different values of \(\Omega_{m0}\). We also fit the observational data to the model independent piecewise constant parametrization. Four redshift bins with boundaries at \(z=0.22\), 0.53, 0.85 and 1.8 were chosen for the piecewise constant parametrization of the equation of state parameter \(w(z)\) of dark energy. We find no significant evidence for evolving \(w(z)\). With the addition of the Hubble parameter, the constraint on the equation of state parameter at high redshift isimproved by 70%. The marginalization of the nuisance parameter connected to the supernova distance modulus is discussed.
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subjects Baryons
Big Bang theory
Constitution
Cosmic microwave background
Dark energy
Equations of state
Mathematical models
Parameterization
Parameters
Red shift
Stellar evolution
Supernovae
title Observational constraint on dynamical evolution of dark energy
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