摘要We consider constraints on purely kinetic k-essence models from the latest observational data (including 182 gold SNIa data, the shift parameter, and the acoustic scale). We find the best-fit values of the parameters are Ωm=0.37±m0.01 and k0=0.064±0.013 at 68.3% confidence level. The phase transition from deceleration to acceleration is found to occur at redshift zq=0~0.48-0.52 in 68.3% confidence level limits. By applying model-comparison statistics (F-test, AICc, and BIC), we find that the purely kinetic k-essence scenario is favored over the ΛCDM model by the combined data. These results are also confirmed by combined data 307 SNIa+R+la.
Abstract：We consider constraints on purely kinetic k-essence models from the latest observational data (including 182 gold SNIa data, the shift parameter, and the acoustic scale). We find the best-fit values of the parameters are Ωm=0.37±m0.01 and k0=0.064±0.013 at 68.3% confidence level. The phase transition from deceleration to acceleration is found to occur at redshift zq=0~0.48-0.52 in 68.3% confidence level limits. By applying model-comparison statistics (F-test, AICc, and BIC), we find that the purely kinetic k-essence scenario is favored over the ΛCDM model by the combined data. These results are also confirmed by combined data 307 SNIa+R+la.
YANG Rong-Jia;GAO Xiang-Ting. Observational Constraints on Purely Kinetic k-Essence Dark Energy Models[J]. 中国物理快报, 2009, 26(8): 89501-089501.
YANG Rong-Jia, GAO Xiang-Ting. Observational Constraints on Purely Kinetic k-Essence Dark Energy Models. Chin. Phys. Lett., 2009, 26(8): 89501-089501.
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