Holographic dark energy models: A comparison from the latest observational data

Details Holographic dark energy models: A comparison from the latest observational data Holographic dark energy models: A comparison from the latest observational data

2009-04-06

arxiv.org/abs/0904.0928v2

JCAP 0906:036,2009

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

14 pages, 4 figures, 1 table, New References Added, Accepted for Publication in JCAP

Scientific paper

10.1088/1475-7516/2009/06/036

The holographic principle of quantum gravity theory has been applied to the dark energy (DE) problem, and so far three holographic DE models have been proposed: the original holographic dark energy (HDE) model, the agegraphic dark energy (ADE) model, and the holographic Ricci dark energy (RDE) model. In this work, we perform the best-fit analysis on these three models, by using the latest observational data including the Union+CFA3 sample of 397 Type Ia supernovae (SNIa), the shift parameter of the cosmic microwave background (CMB) given by the five-year Wilkinson Microwave Anisotropy Probe (WMAP5) observations, and the baryon acoustic oscillation (BAO) measurement from the Sloan Digital Sky Survey (SDSS). The analysis shows that for HDE, $\chi_{min}^{2}=465.912$; for RDE, $\chi_{min}^{2}=483.130$; for ADE, $\chi_{min}^{2}=481.694$. Among these models, HDE model can give the smallest $\chi^2_{min}$. Besides, we also use the Bayesian evidence (BE) as a model selection criterion to make a comparison. It is found that for HDE, ADE, and RDE, $\Delta \ln \mathrm{BE}= -0.86$, -5.17, and -8.14, respectively. So, it seems that the HDE model is more favored by the observational data.

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