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Observational Constraints on the Unified Dark-Energy--Dark-Matter Model |
| WU Pu-Xun1;YU Hong-Wei2 |
| 1School of Sciences and Institute of Physics, Central South University of Forestry and Technology, Changsha 4100042Department of Physics and Institute of Physics, Normal University, Changsha 410081 |
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| Cite this article: |
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WU Pu-Xun, YU Hong-Wei 2007 Chin. Phys. Lett. 24 843-845 |
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Abstract We investigate the constraints on a generalized Chaplygin gas (GCG) model using the gold sample type-Ia supernovae (Sne Ia) data, the new Supernova Legacy Survey (SNLS) Sne Ia data and the size of baryonic acoustic oscillation peak found in Sloan Digital Sky Survey (SDSS). In a spatially flat universe case we obtain, at a 95.4% confidence level, As=0.76-0.07+0.07 and α=0.028-0.238+0.322. Our results are consistent with the ΛCDM model (α=0), but rule out the standard Chaplygin gas model (α=1).
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| Keywords:
98.80.-k
98.80.Es
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Received: 24 November 2006
Published: 08 February 2007
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| PACS: |
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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