constraintsongeneralizedchaplygingasmodelincludinggammaraybursts
文献类型：期刊论文
| 作者 | FaYin Wang1; ZiGao Dai1; Shi Qi2
|
| 刊名 | researchinastronomyandastrophysics
 |
| 出版日期 | 2009 |
| 卷号 | 9期号:5页码:547 |
| ISSN号 | 1674-4527 |
| 英文摘要 | Generalized Chaplygin gas (whose equation of state is p(GCG) = -A/rho(alpha)(GCG)) G was proposed as a candidate for unification of dark energy and dark matter. We investigate constraints on this model with the latest observed data. We test the model with type-la supernovae (SNe Ia), cosmic microwave background (CMB) anisotropy, X-ray gas mass fractions in clusters, and gamma-ray bursts (GRBs). We calibrate the GRB luminosity relations without assuming any cosmological models using SNe Ia. We show that GRBs can extend the Hubble diagram to higher redshifts (z > 6). The GRB Hubble diagram is well behaved and delineates the shape of the Hubble diagram well. We measure A(s) equivalent to A/rho(alpha+1)(GCG,0) = 0.68(-0.08)(+0.04) (where rho(GCG,0) is the energy density today) and alpha = 0.22(-0.13)(+0.15) at the sigma confidence level using all the datasets. Our results rule out the standard Chaplygin gas model (alpha = 1) at the 3 sigma confidence level. The Lambda CDM is allowed at the 2 sigma confidence level. We find that acceleration could have started at a redshift of z similar to 0.70. The concordance of the generalized Chaplygin gas model with the age estimate of an old high redshift quasar is found. In addition, we show that GRBs can break the degeneracy between the generalized Chaplygin gas model and the XCDM model. |
| 语种 | 英语 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/31909]  |
| 专题 | 中国科学院紫金山天文台 |
| 作者单位 | 1.南京大学 2.中国科学院紫金山天文台 |
| 推荐引用方式 GB/T 7714 | FaYin Wang,ZiGao Dai,Shi Qi. constraintsongeneralizedchaplygingasmodelincludinggammaraybursts[J]. researchinastronomyandastrophysics,2009,9(5):547. |
| APA | FaYin Wang,ZiGao Dai,&Shi Qi.(2009).constraintsongeneralizedchaplygingasmodelincludinggammaraybursts.researchinastronomyandastrophysics,9(5),547. |
| MLA | FaYin Wang,et al."constraintsongeneralizedchaplygingasmodelincludinggammaraybursts".researchinastronomyandastrophysics 9.5(2009):547. |
入库方式： OAI收割
来源：紫金山天文台
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。