[Zhao, Gong-Bo] Inst Cosmol & Gravitat, Portsmouth PO1 3FX, Hants, England
; [Zhao, Gong-Bo] Simon Fraser Univ, Dept Phys, Burnaby, BC V5A 1S6, Canada
; [Zhang, Xinmin] Chinese Acad Sci, Inst High Energy Phys, Div Theoret Phys, Beijing 100049, Peoples R China
; [Zhang, Xinmin] Chinese Acad Sci, TPCSF, Beijing 100864, Peoples R China
We report the constraints on the dark energy equation-of-state w(z) using the latest "Constitution" SNe sample combined with the WMAP5 and Sloan Digital Sky Survey data. Assuming a flat Universe, and utilizing the localized principal component analysis and the model selection criteria, we find that the Lambda CDM model is generally consistent with the current data, yet there exists a weak hint of the possible dynamics of dark energy. In particular, a model predicting w(z) < -1 at z is an element of [0.25, 0.5) and w(z) > -1 at z is an element of [0.5, 0.75), which means that w(z) crosses -1 in the range of z is an element of [0.25, 0.75), is mildly favored at 95% confidence level. Given the best fit model for current data as a fiducial model, we make future forecast from the joint data sets of Joint Dark Energy Mission, Planck, and Large Synoptic Survey Telescope, and we find that the future surveys can reduce the error bars on the w bins by roughly a factor of 10 for a 5-w-bin model.