Abstract
We perform a global fit study on the new agegraphic dark energy (NADE) model in a non-flat universe by using the MCMC method with the full CMB power spectra data from the WMAP 7-yr observations, the SNIa data from Union2.1 sample, BAO data from SDSS DR7 and WiggleZ Dark Energy Survey, and the latest measurements of H 0 from HST. We find that the value of Ω k0 is greater than 0 at least at the 3σ confidence levels (CLs), which implies that the NADE model distinctly favors an open universe. Besides, our results show that the value of the key parameter of NADE model, \(n=2.673^{+0.053+0.127+0.199}_{-0.077-0.151-0.222}\), at the 1–3σ CLs, where its best-fit value is significantly smaller than those obtained in previous works. We find that the reason leading to such a change comes from the different SNIa samples used. Our further test indicates that there is a distinct tension between the Union2 sample of SNIa and other observations, and the tension will be relieved once the Union2 sample is replaced by the Union2.1 sample. So, the new constraint result of the NADE model obtained in this work is more reasonable than before.
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Acknowledgements
This work was supported by the National Science Foundation of China under Grant Nos. 10705041, 10975032, 11047112 and 11175042, and by the National Ministry of Education of China under Grant Nos. NCET-09-0276, N100505001, N090305003, and N110405011.
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Zhang, JF., Li, YH. & Zhang, X. A global fit study on the new agegraphic dark energy model. Eur. Phys. J. C 73, 2280 (2013). https://doi.org/10.1140/epjc/s10052-013-2280-6
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DOI: https://doi.org/10.1140/epjc/s10052-013-2280-6