| GEOPHYSICS, ASTRONOMY, AND ASTROPHYSICS |
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Observational Constraints on Purely Kinetic k-Essence Dark Energy Models |
| YANG Rong-Jia, GAO Xiang-Ting |
| College of Physics and Technology, Hebei University, Baoding 071002 |
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| Cite this article: |
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YANG Rong-Jia, GAO Xiang-Ting 2009 Chin. Phys. Lett. 26 089501 |
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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.
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| Keywords:
95.36.+x
98.80.-k
98.80.Es
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Received: 09 April 2009
Published: 30 July 2009
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| PACS: |
95.36.+x
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(Dark energy)
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98.80.-k
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(Cosmology)
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98.80.Es
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(Observational cosmology (including Hubble constant, distance scale, cosmological constant, early Universe, etc))
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