Reconstructing the cosmic expansion history with a monotonicity prior

doi:10.1088/1475-7516/2018/03/045

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	Reconstructing the cosmic expansion history with a monotonicity prior
	Xu, Youhua 1,2; Zhan, Hu 2; Cheung, Yeuk-Kwan Edna 1
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.