Observational constraints on the new generalized Chaplygin gas model

• Published in: Research in astronomy and astrophysics Vol. 13; no. 2; pp. 159 - 169
• Main Authors: Liao, Kai, Pan, Yu, Zhu, Zong-Hong
• Format: Journal Article
• Language: English
• Published: 01.02.2013
• Subjects: Anisotropy; Chaplygin gas; Computer simulation; Cosmic microwave background; Dark matter; Ia型超新星; Monte Carlo methods; Oscillations; Supernovae; 威尔金森微波各向异性探测器; 广义; 数字巡天; 数据模型; 数据观测; 气体模型; 马尔可夫链蒙特卡罗方法
• ISSN: 1674-4527; 2397-6209
• DOI: 10.1088/1674-4527/13/2/003

We use the latest data to investigate observational constraints on the new generalized Chaplygin gas （NGCG） model. Using the Markov Chain Monte Carlo method, we constrain the NGCG model with type Ia supernovae from the Union2 set （557 data）, the usual baryonic acoustic oscillation （BAO） observation from the spectroscopic Sloan Digital Sky Survey data release 7 galaxy sample, the cosmic mi- crowave background observation from the 7-year Wilkinson Microwave Anisotropy Probe results, newly revised data on H（z）, as well as a value of θBAO （Z = 0.55） = （3.90° ±0.38°） for the angular BAO scale. The constraint results for the NGCG model are ωX=-1.0510＋0.1563-0.1685（1σ）＋0.2226-0.2398（2σ）,η=1.0117＋0.0469-0.0502（1σ）＋0.0693-0.0716（2σ）and ΩX=0.7297＋0.0229-0.0276（1σ）＋0.0329-0.0402（2σ）, which give a rather stringent constraint. From the results, we can see that a phantom model is slightly favored and the proba- bility that energy transfers from dark matter to dark energy is a little larger than the inverse.