Reconstructing the cosmic expansion history with a monotonicity prior | |
Xu, Youhua1,2; Zhan, Hu2; Cheung, Yeuk-Kwan Edna1 | |
刊名 | JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS |
2018-03-01 | |
期号 | 3页码:20 |
关键词 | dark matter experiments supernova type Ia - standard candles |
ISSN号 | 1475-7516 |
DOI | 10.1088/1475-7516/2018/03/045 |
英文摘要 | The cosmic expansion history, mapped by the Hubble parameter as a function of redshift, offers the most direct probe of the dark energy equation of state. One way to determine the Hubble parameter at different redshifts is essentially differentiating the cosmic age or distance with respect to redshift, which may incur large numerical errors with observational data. Taking the scenario that the Hubble parameter increases monotonically with redshift as a reasonable prior, we propose to enforce the monotonicity when reconstructing the Hubble parameter at a series of redshifts. Tests with mock type Ia supernova (SN Ia) data show that the monotonicity prior does not introduce significant biases and that errors on the Hubble parameter are greatly reduced compared to those determined with a flat prior at each redshift. Results from real SN Ia data are in good agreement with those based on ages of passively evolving galaxies. Although the Hubble parameter reconstructed from SN Ia distances does not necessarily provide more information than the distances themselves do, it offers a convenient way to compare with constraints from other methods. Moreover, the monotonicity prior is expected to be helpful to other probes that measure the Hubble parameter at multiple redshifts (e.g., baryon acoustic oscillations), and it may be generalized to other cosmological quantities that are reasonably monotonic with redshift. |
资助项目 | National key Research Program of China[2016YFB1000605] ; National Astronomical Observatories of China |
WOS关键词 | LUMINOUS RED GALAXIES ; PROBING DARK ENERGY ; COSMOLOGICAL PARAMETERS ; IA SUPERNOVAE ; MODEL SELECTION ; LIGHT CURVES ; REDSHIFT ; DECELERATION ; QUINTESSENCE ; UNIVERSES |
WOS研究方向 | Astronomy & Astrophysics ; Physics |
语种 | 英语 |
出版者 | IOP PUBLISHING LTD |
WOS记录号 | WOS:000428685100001 |
资助机构 | National key Research Program of China ; National key Research Program of China ; National Astronomical Observatories of China ; National Astronomical Observatories of China ; National key Research Program of China ; National key Research Program of China ; National Astronomical Observatories of China ; National Astronomical Observatories of China ; National key Research Program of China ; National key Research Program of China ; National Astronomical Observatories of China ; National Astronomical Observatories of China ; National key Research Program of China ; National key Research Program of China ; National Astronomical Observatories of China ; National Astronomical Observatories of China |
内容类型 | 期刊论文 |
源URL | [http://ir.bao.ac.cn/handle/114a11/37076] |
专题 | 中国科学院国家天文台 |
通讯作者 | Xu, Youhua |
作者单位 | 1.Nanjing Univ, Sch Phys, 22 Hankou Rd, Nanjing 210093, Jiangsu, Peoples R China 2.Natl Astron Observ, CAS Key Lab Space Astron & Technol, A20 Datun Rd, Beijing 100101, Peoples R China |
推荐引用方式 GB/T 7714 | Xu, Youhua,Zhan, Hu,Cheung, Yeuk-Kwan Edna. Reconstructing the cosmic expansion history with a monotonicity prior[J]. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS,2018(3):20. |
APA | Xu, Youhua,Zhan, Hu,&Cheung, Yeuk-Kwan Edna.(2018).Reconstructing the cosmic expansion history with a monotonicity prior.JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS(3),20. |
MLA | Xu, Youhua,et al."Reconstructing the cosmic expansion history with a monotonicity prior".JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS .3(2018):20. |
个性服务 |
查看访问统计 |
相关权益政策 |
暂无数据 |
收藏/分享 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论