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Investigating the relationship between cosmic curvature and dark energy models with the latest supernova sample
Gao Chao1; Chen Yun2; Zheng Jie1
2020
Source PublicationResearch in Astronomy and Astrophysics
ISSN1674-4527
Volume20Issue:9
AbstractWe investigate the relationship between cosmic curvature and model of dark energy (hereafter DE) with recent Type Ia supernovae (hereafter SNe Ia) data, i.e., the Pantheon sample including 1048 SNe Ia with 0.01 < z < 2.3. We obtain measurements of the dimensionless spatial curvature density today, i.e., ?_(k0) = –0.062_(–0.169)~(+0.189),–0.004_(–0.134)~(+0.228), 0.127_(–0.276)~(+0.280) and 0.422_(–0.338)~(+0.213) at 68%confidence level (CL), respectively, in the scenarios of ΛCDM, ?CDM (i.e., scalar field DE), ωCDM and ω_0ω_aCDM models. In the scenario of ΛCDM model, a closed universe is preferred by the Pantheon sample, which is consistent with that from the Planck CMB spectra. However, the uncertainty of ?_(k0) from the Pantheon SNe sample is about 8 times larger than that from the Planck data, so the former one supports a closed universe at a much lower CL than that from the latter one. An open unverse is supported by the Pantheon sample at ~32% and ~78% CLs, respectively, in the ωCDM and ω_0ω_aCDM models. Among these models, the ?CDM model is the one which supports the flat universe most strongly. It shows that ?_(k0) is significantly dependent on the adopted model of DE, and there is a negative correlation between ?_(k0) and the equation of state of DE.
Keywordcosmological parameters dark energy cosmology: observations
Language英语
WOS IDWOS:000574426600001
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Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/73794
Collection中国科学院国家天文台
Affiliation1.北京师范大学
2.中国科学院国家天文台
Recommended Citation
GB/T 7714
Gao Chao,Chen Yun,Zheng Jie. Investigating the relationship between cosmic curvature and dark energy models with the latest supernova sample[J]. Research in Astronomy and Astrophysics,2020,20(9).
APA Gao Chao,Chen Yun,&Zheng Jie.(2020).Investigating the relationship between cosmic curvature and dark energy models with the latest supernova sample.Research in Astronomy and Astrophysics,20(9).
MLA Gao Chao,et al."Investigating the relationship between cosmic curvature and dark energy models with the latest supernova sample".Research in Astronomy and Astrophysics 20.9(2020).
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