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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
2010
发表期刊JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
ISSN1475-7516
期号4页码:-
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.
部门归属[Cai, RG; Su, QP; Zhang, HB] Chinese Acad Sci, Inst Theoret Phys, Key Lab Frontiers Theoret Phys, Beijing 100190, Peoples R China
关键词Matter Supernovae Universe Model Constraints Galaxies Age
学科领域Physics
资助者NNSF of China[10821504, 10975168]; National Basic Research Program of China[2010CB833000] ; NNSF of China[10821504, 10975168]; National Basic Research Program of China[2010CB833000] ; NNSF of China[10821504, 10975168]; National Basic Research Program of China[2010CB833000] ; NNSF of China[10821504, 10975168]; National Basic Research Program of China[2010CB833000]
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收录类别SCI
资助者NNSF of China[10821504, 10975168]; National Basic Research Program of China[2010CB833000] ; NNSF of China[10821504, 10975168]; National Basic Research Program of China[2010CB833000] ; NNSF of China[10821504, 10975168]; National Basic Research Program of China[2010CB833000] ; NNSF of China[10821504, 10975168]; National Basic Research Program of China[2010CB833000]
WOS记录号WOS:000277684600021
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被引频次:16[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.itp.ac.cn/handle/311006/5137
专题理论物理所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
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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):-.
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