Estimating the uncorrelated dark energy evolution in the Planck era

F. Y. Wang and Z. G. Dai

Phys. Rev. D 89, 023004 – Published 14 January 2014

Abstract

The equation of state (EOS), $w (z)$ , is the most important parameter of dark energy. We reconstruct the evolution of this EOS in a model-independent way using the latest cosmic microwave background (CMB) data from Planck and other observations, such as type Ia supernovae, the baryonic acoustic oscillation measurements (SDSS, 6dF, BOSS, and WiggleZ), and the Hubble parameter value $H (z)$ . The results show that the EOS is consistent with the cosmological constant at the $2 σ$ confidence level, not preferring a dynamical dark energy. The uncorrelated EOS of dark energy constraints from Planck CMB data are much tighter than those from the WMAP 9-year CMB data.

Received 18 May 2013

DOI:https://doi.org/10.1103/PhysRevD.89.023004

Authors & Affiliations

F. Y. Wang^1,2,* and Z. G. Dai^1,2,†

¹School of Astronomy and Space Science, Nanjing University, Nanjing 210093, China
²Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University), Ministry of Education, Nanjing 210093, China

^*fayinwang@nju.edu.cn
^†dzg@nju.edu.cn

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Vol. 89, Iss. 2 — 15 January 2014

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Physical Review D

covering particles, fields, gravitation, and cosmology