Evolution of Dark Energy Reconstructed from the Latest Observations
文献类型：期刊论文
| 作者 | Wang, Yuting1 ; Pogosian, Levon2,3; Zhao, Gong-Bo1,3,4; Zucca, Alex2
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| 刊名 | ASTROPHYSICAL JOURNAL LETTERS
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| 出版日期 | 2018-12-10 |
| 卷号 | 869期号:1页码:8 |
| 关键词 | dark energy |
| ISSN号 | 2041-8205 |
| DOI | 10.3847/2041-8213/aaf238 |
| 英文摘要 | We reconstruct the evolution of the dark energy (DE) density using a nonparametric Bayesian approach from a combination of the latest observational data. We caution against parameterizing DE in terms of its equation of state as it can be singular in modified gravity models, and using it introduces a bias preventing negative effective DE densities. We find a 3.7 sigma preference for an evolving effective DE density with interesting features. For example, it oscillates around the. cold dark matter prediction at z less than or similar to 0.7, and could be negative at z greater than or similar to 2.3; DE can be pressure-less at multiple redshifts, and a short period of cosmic deceleration is allowed at 0.1 less than or similar to z less than or similar to 0.2. We perform the reconstruction for several choices of the prior, as well as a evidence-weighted reconstruction. We find that some of the dynamical features, such as the oscillatory behavior of the DE density, are supported by the Bayesian evidence, which is a first detection of a dynamical DE with a positive Bayesian evidence. The evidence-weighted reconstruction prefers a dynamical DE at a (2.5 +/- 0.06)sigma significance level. |
| WOS关键词 | BARYON ACOUSTIC-OSCILLATIONS ; COSMOLOGICAL CONSEQUENCES ; SAMPLE ; COMPONENT ; EQUATION |
| 资助项目 | NSFC[1171001024] ; NSFC[11673025] ; National Key Basic Research and Development Program of China[2018YFA0404503] ; Nebula Talents Program of NAOC ; National Sciences and Engineering Research Council of Canada ; University of Portsmouth ; NAOC ; Young Researcher Grant of NAOC |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000452550800003 |
| 出版者 | IOP PUBLISHING LTD |
| 资助机构 | NSFC ; NSFC ; National Key Basic Research and Development Program of China ; National Key Basic Research and Development Program of China ; Nebula Talents Program of NAOC ; Nebula Talents Program of NAOC ; National Sciences and Engineering Research Council of Canada ; National Sciences and Engineering Research Council of Canada ; University of Portsmouth ; University of Portsmouth ; NAOC ; NAOC ; Young Researcher Grant of NAOC ; Young Researcher Grant of NAOC ; NSFC ; NSFC ; National Key Basic Research and Development Program of China ; National Key Basic Research and Development Program of China ; Nebula Talents Program of NAOC ; Nebula Talents Program of NAOC ; National Sciences and Engineering Research Council of Canada ; National Sciences and Engineering Research Council of Canada ; University of Portsmouth ; University of Portsmouth ; NAOC ; NAOC ; Young Researcher Grant of NAOC ; Young Researcher Grant of NAOC ; NSFC ; NSFC ; National Key Basic Research and Development Program of China ; National Key Basic Research and Development Program of China ; Nebula Talents Program of NAOC ; Nebula Talents Program of NAOC ; National Sciences and Engineering Research Council of Canada ; National Sciences and Engineering Research Council of Canada ; University of Portsmouth ; University of Portsmouth ; NAOC ; NAOC ; Young Researcher Grant of NAOC ; Young Researcher Grant of NAOC ; NSFC ; NSFC ; National Key Basic Research and Development Program of China ; National Key Basic Research and Development Program of China ; Nebula Talents Program of NAOC ; Nebula Talents Program of NAOC ; National Sciences and Engineering Research Council of Canada ; National Sciences and Engineering Research Council of Canada ; University of Portsmouth ; University of Portsmouth ; NAOC ; NAOC ; Young Researcher Grant of NAOC ; Young Researcher Grant of NAOC |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/23854]  |
| 专题 | 中国科学院国家天文台 |
| 通讯作者 | Wang, Yuting |
| 作者单位 | 1.Chinese Acad Sci, Natl Astron Observ, Beijing 100101, Peoples R China 2.Simon Fraser Univ, Dept Phys, Burnaby, BC V5A 1S6, Canada 3.Univ Portsmouth, Inst Cosmol & Gravitat, Portsmouth PO1 3FX, Hants, England 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wang, Yuting,Pogosian, Levon,Zhao, Gong-Bo,et al. Evolution of Dark Energy Reconstructed from the Latest Observations[J]. ASTROPHYSICAL JOURNAL LETTERS,2018,869(1):8. |
| APA | Wang, Yuting,Pogosian, Levon,Zhao, Gong-Bo,&Zucca, Alex.(2018).Evolution of Dark Energy Reconstructed from the Latest Observations.ASTROPHYSICAL JOURNAL LETTERS,869(1),8. |
| MLA | Wang, Yuting,et al."Evolution of Dark Energy Reconstructed from the Latest Observations".ASTROPHYSICAL JOURNAL LETTERS 869.1(2018):8. |
入库方式： OAI收割
来源：国家天文台
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