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Curvature from Strong Gravitational Lensing: A Spatially Closed Universe or Systematics?
- Source :
- Astrophysical Journal; 2/20/2018, Vol. 854 Issue 2, p1-1, 1p
- Publication Year :
- 2018
-
Abstract
- 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–Lemaître–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. [ABSTRACT FROM AUTHOR]
- Subjects :
- CURVATURE
GRAVITATIONAL lenses
CONSTRAINTS (Physics)
DARK energy
QUASARS
Subjects
Details
- Language :
- English
- ISSN :
- 0004637X
- Volume :
- 854
- Issue :
- 2
- Database :
- Complementary Index
- Journal :
- Astrophysical Journal
- Publication Type :
- Academic Journal
- Accession number :
- 128188286
- Full Text :
- https://doi.org/10.3847/1538-4357/aaa76f