Probing the dynamical behavior of dark energy
文献类型：期刊论文
| 作者 | 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
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| 刊名 | JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
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| 出版日期 | 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 |
| 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):-. |
入库方式： OAI收割
来源：理论物理研究所
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