Curvature from Strong Gravitational Lensing: A Spatially Closed Universe or Systematics?

被引：25

作者：

Li, Zhengxiang ^{[1
]}

Ding, Xuheng ^{[1
,2
]}

Wang, Guo-Jian ^{[1
]}

Liao, Kai ^{[3
]}

Zhu, Zong-Hong ^{[1
]}

机构：

[1] Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China

[2] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA

[3] Wuhan Univ Technol, Sch Sci, Wuhan 430070, Hubei, Peoples R China

来源：

ASTROPHYSICAL JOURNAL | 2018年 / 854卷 / 02期

基金：

中国国家自然科学基金;

关键词：

cosmological parameters; cosmology: observations; DARK ENERGY; CONSTRAINTS; DISTANCE; TESTS;

D O I：

10.3847/1538-4357/aaa76f

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Model-independent constraints on the spatial curvature are not only closely related to important problems, such as the evolution of the universe and properties of dark energy, but also provide a test of the validity of the fundamental Copernican principle. In this paper, with the distance sum rule in the Friedmann-Lemaitre-Robertson-Walker metric, we achieve model-independent measurements of the spatial curvature from the latest type Ia supernovae and strong gravitational lensing (SGL) observations. We find that a spatially closed universe is preferred. Moreover, by considering different kinds of velocity dispersion and subsamples, we study possible factors that might affect model-independent estimations for the spatial curvature from SGL observations. It is suggested that the combination of observational data from different surveys might cause a systematic bias, and the tension between the spatially flat universe and SGL observations is alleviated when the subsample only from the Sloan Lens ACS Survey is used or a more complex treatment for the density profile of lenses is considered.

引用

页数：8

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