Cold dark matter isocurvature perturbations: Cosmological constraints and applications

	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
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
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.
学科主题	Astronomy & Astrophysics; Physics
类目[WOS]	Astronomy & Astrophysics ; Physics, Particles & Fields
研究领域[WOS]	Astronomy & Astrophysics ; Physics
原文出处	SCI
语种	英语
WOS记录号	WOS:000291659200003
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/240981]
专题	高能物理研究所_理论物理室高能物理研究所_粒子天体物理中心
作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	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.