Exploring the low redshift universe: two parametric models for effective pressure
文献类型：期刊论文
| 作者 | Zhang, Q; Yang, G; Zou, QX; Meng, XH; Shen, KJ |
| 刊名 | EUROPEAN PHYSICAL JOURNAL C
 |
| 出版日期 | 2015 |
| 卷号 | 75期号:7页码:300 |
| 通讯作者 | Zhang, Q (reprint author), Nankai Univ, Dept Phys, Tianjin 300071, Peoples R China. |
| 英文摘要 | Astrophysical observations have put unprecedentedly tight constraints on cosmological theories. The ACDM model, mathematically simple and fits observational data sets well, is preferred for explaining the behavior of universe. But many basic features of the dark sectors are still unknown, which leaves room for various nonstandard cosmological hypotheses. As the pressure of the cosmological constant dark energy is unvarying, ignoring contributions from radiation and curvature terms at low redshift, the effective pressure keeps constant. In this paper, we propose two parametric models for a non-constant effective pressure in order to study the tiny deviation from ACDM at low redshift. We recover our phenomenological models in the scenarios of quintessence and phantom fields, and we explore the behavior of the scalar field and potential. We constrain our model parameters with SNe Ia and BAO observations, and we detect subtle hints of omega(de) < -1 from the data-fitting results of both models, which indicates possibly a phantom dark energy scenario at present. |
| 学科主题 | Physics |
| 类目[WOS] | Physics, Particles & Fields |
| 关键词[WOS] | EQUATION-OF-STATE ; DARK ENERGY ; COSMOLOGICAL-CONSTANT ; R-1-MODIFIED GRAVITY ; FRIEDMANN EQUATIONS ; BULK VISCOSITY ; ACCELERATION ; EVOLUTION ; MATTER ; FIELD |
| 收录类别 | SCI |
| 语种 | 英语 |
| 源URL | [http://ir.itp.ac.cn/handle/311006/20939]  |
| 专题 | 理论物理研究所_理论物理所1978-2010年知识产出 |
| 推荐引用方式 GB/T 7714 | Zhang, Q,Yang, G,Zou, QX,et al. Exploring the low redshift universe: two parametric models for effective pressure[J]. EUROPEAN PHYSICAL JOURNAL C,2015,75(7):300. |
| APA | Zhang, Q,Yang, G,Zou, QX,Meng, XH,&Shen, KJ.(2015).Exploring the low redshift universe: two parametric models for effective pressure.EUROPEAN PHYSICAL JOURNAL C,75(7),300. |
| MLA | Zhang, Q,et al."Exploring the low redshift universe: two parametric models for effective pressure".EUROPEAN PHYSICAL JOURNAL C 75.7(2015):300. |
入库方式： OAI收割
来源：理论物理研究所
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