Constraining the dynamical dark energy parameters: Planck-2013 vs WMAP9

B. Novosyadlyj; O. Sergijenko; R. Durrer; V. Pelykh

doi:10.1088/1475-7516/2014/05/030

paper

Constraining the dynamical dark energy parameters: Planck-2013 vs WMAP9

arXiv:1312.6579 · doi:10.1088/1475-7516/2014/05/030

Abstract

We determine the best-fit values and confidence limits for dynamical dark energy parameters together with other cosmological parameters on the basis of different datasets which include WMAP9 or Planck-2013 results on CMB anisotropy, BAO distance ratios from recent galaxy surveys, magnitude-redshift relations for distant SNe Ia from SNLS3 and Union2.1 samples and the HST determination of the Hubble constant. We use a Markov Chain Monte Carlo routine to map out the likelihood in the multi-dimensional parameter space. We show that the most precise determination of cosmological parameters with the narrowest confidence limits is obtained for the Planck{+}HST{+}BAO{+}SNLS3 dataset. The best-fit values and 2 $σ$ confidence limits for cosmological parameters in this case are $Ω_{d e} = 0.718 \pm 0.022$ , $w_{0} = - 1.1 5_{- 0.16}^{+ 0.14}$ , $c_{a}^{2} = - 1.1 5_{- 0.46}^{+ 0.02}$ , $Ω_{b} h^{2} = 0.0220 \pm 0.0005$ , $Ω_{c d m} h^{2} = 0.121 \pm 0.004$ , $h = 0.713 \pm 0.027$ , $n_{s} = 0.95 8_{- 0.010}^{+ 0.014}$ , $A_{s} = (2.21 5_{- 0.101}^{+ 0.093}) \cdot 1 0^{- 9}$ , $τ_{r e i} = 0.09 3_{- 0.028}^{+ 0.022}$ . For this dataset, the $Λ$ CDM model is just outside the 2 $σ$ confidence region, while for the dataset WMAP9{+}HST{+}BAO{+}SNLS3 the $Λ$ CDM model is only 1 $σ$ away from the best fit. The tension in the determination of some cosmological parameters on the basis of two CMB datasets WMAP9 and Planck-2013 is highlighted.

16 pages, 5 figures, 2 tables; accepted for publication in JCAP

Constraining the dynamical dark energy parameters: Planck-2013 vs WMAP9

Abstract

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