Cosmic Constraints to wCDM Model from Strong Gravitational Lensing

摘要: In this paper, we study the cosmic constraint to $w$CDM model via $118$ strong gravitational lensing systems which are complied from SLACS, BELLS, LSD and SL2S surveys, where ratio between two angular diameter distances $D^{obs} = D_A(z_l,z_s)/D_A(0,z_s)$ is taken as a observable. To obtain ratio, adopt models: one singular isothermal sphere (SIS), other power-law density profile (PLP) model. Via Markov Chain Mote Carlo method, posterior distribution of cosmological parameters space obtained. The results show that not sensitive parameterized forms index $\gamma$. Furthermore, PLP gives relative tighter than SIS predicted value $\Omega_m=0.31^{+0.44}_{-0.24}$ by compatible with obtained {\it Planck}2015: $\Omega_{m}=0.313\pm0.013$. However, $\Omega_m=0.15^{+0.13}_{-0.11}$ based on smaller has $1.25\sigma$ tension Planck}2015 result. This discrepancy maybe come systematic errors.