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Reconstructing the cosmic expansion history with a monotonicity prior
Xu, Youhua1,2; Zhan, Hu2; Cheung, Yeuk-Kwan Edna1
2018-03-01
Source PublicationJOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
ISSN1475-7516
Issue3Pages:20
AbstractThe 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.
Keyworddark matter experiments supernova type Ia - standard candles
Funding OrganizationNational 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
DOI10.1088/1475-7516/2018/03/045
WOS KeywordLUMINOUS RED GALAXIES ; PROBING DARK ENERGY ; COSMOLOGICAL PARAMETERS ; IA SUPERNOVAE ; MODEL SELECTION ; LIGHT CURVES ; REDSHIFT ; DECELERATION ; QUINTESSENCE ; UNIVERSES
Language英语
Funding ProjectNational key Research Program of China[2016YFB1000605] ; National Astronomical Observatories of China
Funding OrganizationNational 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
WOS Research AreaAstronomy & Astrophysics ; Physics
WOS SubjectAstronomy & Astrophysics ; Physics, Particles & Fields
WOS IDWOS:000428685100001
PublisherIOP PUBLISHING LTD
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Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/37077
Collection中国科学院国家天文台
Corresponding AuthorXu, Youhua
Affiliation1.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
Recommended Citation
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.
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