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

Abstract

The holographic principle of quantum gravity theory has been appliedto the dark energy (DE) problem, and so far three holographic DEmodels have been proposed: the original holographic dark energy(HDE) model, the agegraphic dark energy (ADE) model, and theholographic Ricci dark energy (RDE) model. In this work, we performthe best-fit analysis on these three models, by using the latestobservational data including the Union+CFA3 sample of 397 Type Iasupernovae (SNIa), the shift parameter of the cosmic microwavebackground (CMB) given by the five-year Wilkinson MicrowaveAnisotropy Probe (WMAP5) observations, and the baryon acousticoscillation (BAO) measurement from the Sloan Digital Sky Survey(SDSS). The analysis shows that for HDE, χmin2 = 465.912;for RDE, χmin2 = 483.130; for ADE,χmin2 = 481.694. Among these models, HDE model can give thesmallest χ2min. Besides, we also use the Bayesian evidence(BE) as a model selection criterion to make a comparison. It isfound that for HDE, ADE, and RDE, Δln BE = −0.86,−5.17, and −8.14, respectively. So, it seems that the HDE modelis more favored by the observational data.