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
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
摘要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).
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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2007, Vol. 24 
