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

Apr, 2009
13 pages
Published in:
  • JCAP 06 (2009) 036
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Abstract: (arXiv)
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, χmin2=465.912\chi_{min}^{2}=465.912/ for RDE, χmin2=483.130\chi_{min}^{2}=483.130/ for ADE, χmin2=481.694\chi_{min}^{2}=481.694. Among these models, HDE model can give the smallest χmin2\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, Δln⁡BE=−0.86\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.
  • 95.36.+x
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