Probing the dynamical behavior of dark energy

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	Probing the dynamical behavior of dark energy
	Cai, Rong-Gen; Su, Qiping; Zhang, Hong-Bo; Cai, RG , Chinese Acad Sci, Inst Theoret Phys, Key Lab Frontiers Theoret Phys, POB 2735, Beijing 100190, Peoples R China
刊名	JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
	2010
期号	4 页码:-
关键词	Matter Supernovae Universe Model Constraints Galaxies Age
ISSN号	1475-7516
英文摘要	We investigate dynamical behavior of the equation of state of dark energy w(de) by employing the linear-spline method in the region of low redshifts from observational data (SnIa, BAO, CMB and 12 H(z) data). The redshift is binned and w(de) is approximated by a linear expansion of redshift in each bin. We leave the divided points of redshift bins as free parameters of the model, the best-fitted values of divided points will represent the turning positions of w(de) where w(de) changes its evolving direction significantly (if there exist such turnings in our considered region). These turning points are natural divided points of redshift bins, and w(de) between two nearby divided points can be well approximated by a linear expansion of redshift. We find two turning points of w(de) in z is an element of (0, 1.8) and one turning point in z is an element of (0, 0.9), and w(de)(z) could be oscillating around w = -1. Moreover, we find that there is a 2 sigma deviation of w(de) from -1 around z = 0.9 in both correlated and uncorrelated estimates.
学科主题	Physics
URL标识	查看原文
WOS记录号	WOS:000277684600021
公开日期	2012-08-02
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/5137]
专题	理论物理研究所_理论物理所1978-2010年知识产出
通讯作者	Cai, RG , Chinese Acad Sci, Inst Theoret Phys, Key Lab Frontiers Theoret Phys, POB 2735, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Cai, Rong-Gen,Su, Qiping,Zhang, Hong-Bo,et al. Probing the dynamical behavior of dark energy[J]. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS,2010(4):-.
APA	Cai, Rong-Gen,Su, Qiping,Zhang, Hong-Bo,&Cai, RG , Chinese Acad Sci, Inst Theoret Phys, Key Lab Frontiers Theoret Phys, POB 2735, Beijing 100190, Peoples R China.(2010).Probing the dynamical behavior of dark energy.JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS(4),-.
MLA	Cai, Rong-Gen,et al."Probing the dynamical behavior of dark energy".JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS .4(2010):-.