TEST OF PARAMETRIZED POST-NEWTONIAN GRAVITY WITH GALAXY-SCALE STRONG LENSING SYSTEMS

被引:31
作者
Cao, Shuo [1 ]
Li, Xiaolei [1 ]
Biesiada, Marek [1 ,2 ]
Xu, Tengpeng [1 ]
Cai, Yongzhi [1 ]
Zhu, Zong-Hong [1 ]
机构
[1] Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China
[2] Univ Silesia, Inst Phys, Dept Astrophys & Cosmol, Uniwersytecka 4, PL-40007 Katowice, Poland
基金
中国国家自然科学基金; 中国博士后科学基金;
关键词
galaxies: structure; gravitational lensing: strong; cosmology: observations; ALL-SKY SURVEY; DARK ENERGY; COSMOLOGICAL PARAMETERS; INTERNAL STRUCTURE; ACS SURVEY; CONSTRAINTS; MASS; REDSHIFT; SUBSTRUCTURE; STATISTICS;
D O I
10.3847/1538-4357/835/1/92
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Based on a mass-selected sample of galaxy-scale strong gravitational lenses from the SLACS, BELLS, LSD and SL2S surveys and using a well-motivated fiducial set of lens-galaxy parameters we tested the weak-field metric on kiloparsec scales and found a constraint on the post-Newtonian parameter gamma=0.995(-0.047)(+0.037) under the assumption of a flat Lambda CDM universe with parameters taken from Planck observations. General relativity (GR) predicts exactly gamma=1. Uncertainties concerning the total mass density profile, anisotropy of the velocity dispersion and the shape of the light-profile combine to systematic uncertainties of similar to 25%. By applying a cosmological model independent method to the simulated future LSST data, we found a significant degeneracy between the PPN gamma parameter and spatial curvature of the Universe. Setting a prior on the cosmic curvature parameter -0.007< Omega(k) <0.006, we obtained the following constraint on the PPN parameter: gamma=1.000(-0.0025)(+0.0023). We conclude that strong-lensing systems with measured stellar velocity dispersions may serve as another important probe to investigate validity of the GR, if the mass-dynamical structure of the lensing galaxies is accurately constrained in the future lens surveys.
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页数:7
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