Cold dark matter isocurvature perturbations: Cosmological constraints and applications
Li H(李虹); Liu J(刘杰); Li, H; Liu, J; Xia, JQ; Cai, YF
刊名PHYSICAL REVIEW D
2011
卷号83期号:12页码:123517
学科分类Astronomy & Astrophysics; Physics
DOI10.1103/PhysRevD.83.123517
通讯作者[Li, Hong ; Liu, Jie] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China ; [Li, Hong] Chinese Acad Sci, TPCSF, Beijing 100049, Peoples R China ; [Xia, Jun-Qing] Scuola Int Super Studi Avanzati, I-34136 Trieste, Italy ; [Cai, Yi-Fu] Arizona State Univ, Dept Phys, Tempe, AZ 85287 USA
文章类型Article
英文摘要In this paper we present the constraints on cold dark matter (CDM) isocurvature contributions to the cosmological perturbations. By employing Markov chain Monte Carlo method, we perform a global analysis for cosmological parameters using the latest astronomical data, such as 7-year Wilkinson Microwave Anisotropy Probe (WMAP7) observations, matter power spectrum from the Sloan Digital Sky Survey, luminous red galaxies, and the Union2 type Ia supernovae sample. We find that the correlated mixture of adiabatic and isocurvature modes is slightly favored by the current observational data. We also obtain a tight limit on the fraction of the CDM isocurvature contributions, which should be less than 14.6% at 95% confidence level. With the presence of the isocurvature modes, the adiabatic spectral index becomes slightly bigger, n(s)(adi) 0.972 +/- 0.014 (1 sigma), and the tilt for isocurvature spectrum could be large, namely, the best fit value is n(s)(iso) 3.020. Finally, we discuss the effect on WMAP normalization priors, shift parameter R, acoustic scale l(A), and z(*), from the CDM isocurvature perturbation. By fitting the mixed initial condition to the combined data, we find the mean values of R, l(A), and z(*) can be changed about 2.9 sigma, 2.8 sigma, and 1.5 sigma respectively, comparing with those obtained in the pure adiabatic condition.
类目[WOS]Astronomy & Astrophysics ; Physics, Particles & Fields
研究领域[WOS]Astronomy & Astrophysics ; Physics
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语种英语
WOS记录号WOS:000291659200003
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文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/240981
专题中国科学院高能物理研究所_理论物理室_期刊论文
中国科学院高能物理研究所_粒子天体物理中心
作者单位中国科学院高能物理研究所
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Li H,Liu J,Li, H,et al. Cold dark matter isocurvature perturbations: Cosmological constraints and applications[J]. PHYSICAL REVIEW D,2011,83(12):123517.
APA 李虹,刘杰,Li, H,Liu, J,Xia, JQ,&Cai, YF.(2011).Cold dark matter isocurvature perturbations: Cosmological constraints and applications.PHYSICAL REVIEW D,83(12),123517.
MLA 李虹,et al."Cold dark matter isocurvature perturbations: Cosmological constraints and applications".PHYSICAL REVIEW D 83.12(2011):123517.
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