Investigating the relationship between cosmic curvature and dark energy models with the latest supernova sample  

作　　者：Chao Gao Yun Chen Jie Zheng 高超;陈云;郑捷(Department of Astronomy,Beijing Normal University,Beijing 100089,China;Key Laboratory for Computational Astrophysics,National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China)

机构地区：[1]lDepartment of Astronomy,Beijing Normal University,Beijing 100089,China [2]Key Laboratory for Computational Astrophysics,National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China

出　　处：《Research in Astronomy and Astrophysics》2020年第9期319-324,共6页天文和天体物理学研究（英文版）

基　　金：the National Natural Science Foundation of China(Nos.11633001,11920101003,11703034,11773032 and 11573031);the Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDB23000000);the Interdiscipline Research Funds of Beijing Normal University;the NAOC Nebula Talents Program。

摘　　要：We investigate the relationship between cosmic curvature and model of dark energy(hereafter DE)with recent TypeⅠa supernovae(hereafter SNeⅠa)data,i.e.,the Pantheon sample including 1048 SNeⅠa with 0.01<z<2.3.We obtain measurements of the dimensionless spatial curvature density today,i.e.,Ωk0=-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 ACDM,φCDM(i.e.,scalar field DE),ωCDM andω0ωaCDM models.In the scenario of ACDM model,a closed universe is preferred by the Pantheon sample,which is consistent with that from the Planck CMB spectra.However,the uncertainty of Qko 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 theωCDM andω0ωaCDM models.Among these models,theφCDM model is the one which supports the flat universe most strongly.It shows that Qk0 is significantly dependent on the adopted model of DE,and there is a negative correlation betweenΩk0 and the equation of state of DE.

关 键 词：cosmological parameters dark energy cosmology:observations 

分 类 号：P159[天文地球—天文学]