4.7 Article

General cosmography model with spatial curvature

期刊

出版社

OXFORD UNIV PRESS
DOI: 10.1093/mnras/stz3308

关键词

cosmologgical parameters; cosmology: observations

资金

  1. National Natural Science Foundation of China [11675032]

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We adopt a cosmographic approach in order to determine spatial curvature (i.e. Omega(K)), combining the latest release of cosmic chronometer (CC) data, the Pantheon sample of Type Ia supernovae observations and baryon acoustic oscillation measurements. We use the expanded transverse comoving distance D-M(z) as a basic function for deriving H(z) and other cosmic distances. In this scenario, Omega(K) can be constrained only by CC data. To overcome the convergence issues at high-redshift domains, two methods are applied: the Pade approximants and the Taylor series in terms of the new redshift y = z/(1 + z). Adopting the Bayesian evidence, we find that there is positive evidence for the Pade approximant up to order (2,2) and weak evidence for the Taylor series up to third order against the Lambda CDM + Omega(K) model. The constraint results show that a closed Universe is preferred by present observations under all the approximations used in this study. Also, the tension level of the Hubble constant H-0 has less than 2 sigma significance between different approximations and the local distance ladder determination. For each assumed approximation, H-0 is anticorrelated with Omega(K) and the sound horizon at the end of the radiation drag epoch, which indicates that the H-0 tension problem can be slightly relaxed by introducing Omega(K) or any new physics that can reduce the sound horizon in the early Universe.

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