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题名: Exploring the low redshift universe: two parametric models for effective pressure
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
学科分类: Physics
DOI: http://dx.doi.org/10.1140/epjc/s10052-015-3531-5
通讯作者: Zhang, Q (reprint author), Nankai Univ, Dept Phys, Tianjin 300071, Peoples R China.
文章类型: Article
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.
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
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/20939
Appears in Collections:理论物理所2015年知识产出_期刊论文

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Recommended Citation:
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.
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