ITP OpenIR  > 理论物理所2015年知识产出
Exploring the low redshift universe: two parametric models for effective pressure
Zhang, Q; Yang, G; Zou, QX; Meng, XH; Shen, KJ; Zhang, Q (reprint author), Nankai Univ, Dept Phys, Tianjin 300071, Peoples R China.
2015
发表期刊EUROPEAN PHYSICAL JOURNAL C
卷号75期号:7页码:300
文章类型Article
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.
学科领域Physics
DOIhttp://dx.doi.org/10.1140/epjc/s10052-015-3531-5
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
WOS类目Physics, Particles & Fields
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文献类型期刊论文
条目标识符http://ir.itp.ac.cn/handle/311006/20939
专题理论物理所2015年知识产出
通讯作者Zhang, Q (reprint author), Nankai Univ, Dept Phys, Tianjin 300071, Peoples R China.
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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,&Zhang, Q .(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.
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