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题名: Coupled dark energy with perturbed Hubble expansion rate
作者: Yang, WQ ;  Xu, LX
刊名: PHYSICAL REVIEW D
出版日期: 2014
卷号: 90, 期号:8, 页码:83532
关键词: OSCILLATION SPECTROSCOPIC SURVEY ;  BARYON ACOUSTIC-OSCILLATIONS ;  INTERACTING QUINTESSENCE ;  REDSHIFT-SPACE ;  GROWTH-RATE ;  MODELS ;  MATTER ;  CONSTRAINTS ;  GALAXIES ;  PERTURBATIONS
学科分类: Physics
DOI: 10.1103/PhysRevD.90.083532
通讯作者: Yang, WQ (reprint author), Dalian Univ Technol, Sch Phys & Optoelect Technol, Inst Theoret Phys, Dalian 116024, Peoples R China.
部门归属: [Yang, Weiqiang ;  Xu, Lixin] Dalian Univ Technol, Sch Phys & Optoelect Technol, Inst Theoret Phys, Dalian 116024, Peoples R China ;  [Xu, Lixin] Chinese Acad Sci, Inst Theoret Phys, State Key Lab Theoret Phys, Beijing 100190, Peoples R China
英文摘要: The coupling between dark sectors provides a possible approach to mitigate the coincidence problem of the cosmological standard model. In this paper, dark energy is treated as a fluid with a constant equation of state, whose coupling with dark matter is proportional the Hubble parameter and energy density of dark energy, that is, (Q) over bar = 3 xi(x)(H) over bar(rho) over bar (x). In particular, we consider the Hubble expansion rate to be perturbed in the perturbation evolutions of dark sectors. Using joint data sets which include cosmic microwave background radiation, baryon acoustic oscillation, type Ia supernovae, and redshift-space distortions, we perform a full Markov chain Monte Carlo likelihood analysis for the coupled model. The results show that the mean value with errors of the interaction rate is xi(x) = 0.00305(-0.00305-0.00305-0.00305)(+0.000645+0.00511+0.00854) for Q(A)(mu)parallel to u(c)(mu) and xi(x) = 0.00317(-0.00317-0.00317-0.00317)(+0.000628+0.00547+0.00929) for Q(A)(mu)parallel to u(x)(mu), which means that the recent cosmic observations favor a small interaction rate which is up to the order of 10(-3). Moreover, in contrast to the coupled model with an unperturbed expansion rate, we find the perturbed Hubble expansion rate can bring about a negligible impact on the model parameter space.
资助者: NSFC [11275035]; Fundamental Research Funds for the Central Universities [DUT13LK01]
收录类别: SCI
原文出处: 查看原文
语种: 英语
WOS记录号: WOS:000350215700001
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/15599
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Recommended Citation:
Yang, WQ,Xu, LX. Coupled dark energy with perturbed Hubble expansion rate[J]. PHYSICAL REVIEW D,2014,90(8):83532.
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