Implications from simulated strong gravitational lensing systems: constraining cosmological parameters using Gaussian Processes

Abstract

Strongly gravitational lensing systems (SGL) encodes cosmology information in source/lens distance ratios ${\mathcal{D}}_{\mathrm{obs}}={\mathcal{D}}_{\mathrm{ls}}/{\mathcal{D}}_{\mathrm{s}}$, which can be used to precisely constrain cosmological parameters. In this paper, based on future measurements of 390 strong lensing systems from the forthcoming LSST survey, we have successfully reconstructed the distance ratio ${\mathcal{D}}_{\mathrm{obs}}$ (with the source redshift $z_s\sim 4.0$), directly from the data without assuming any parametric form. A recently developed method based on model-independent reconstruction approach, Gaussian Processes (GP) is used in our study of these strong lensing systems. Our results show that independent measurement of the matter density parameter (${\Omega }_m$) could be expected from such strong lensing statistics. More specifically, one can expect ${\Omega }_m$ to be estimated at the precision of $\Delta {\Omega }_m\sim 0.015$ in the concordance $\Lambda$CDM model, which provides comparable constraint on ${\Omega }_m$ with Planck 2015 results. In the framework of the modified gravity theory (DGP), 390 detectable galactic lenses from future LSST survey would lead to stringent fits of $\Delta {\Omega }_m\sim 0.030$. \textbf{Finally, we have discussed three possible sources of systematic errors (sample incompleteness, the determination of length of lens redshift bin, and the choice of lens redshift shells), and quantified their effects on the final cosmological constraints. Our results strongly indicate that future strong lensing surveys, with the accumulation of a larger and more accurate sample of detectable galactic lenses, will considerably benefit from the methodology described in this analysis. }

References in corpus (11)

• Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
• The Structure & Dynamics of Massive Early-type Galaxies: On Homology, Isothermality and Isotropy inside one Effective Radius
• RingFinder: automated detection of galaxy-scale gravitational lenses in ground-based multi-filter imaging data
• Reconstructing the interaction between dark energy and dark matter using Gaussian Processes
• Using H(z) data as a probe of the concordance model
• Ultra-compact structure in intermediate-luminosity radio quasars: building a sample of standard cosmological rulers and improving the dark energy constraints up to $z\sim 3$
• Cosmological parameters from strong gravitational lensing and stellar dynamics in elliptical galaxies
• How robust are the constraints on cosmology and galaxy evolution from the lens-redshift test?
• Testing the Etherington's distance duality relation at higher redshifts: the combination of radio quasars and gravitational waves
• Detectability of a phantom-like braneworld model with the integrated Sachs-Wolfe effect
• Implications of the lens redshift distribution of strong lensing systems: cosmological parameters and the global properties of early-type galaxies

Cited by in corpus (2)

• Model-independent constraints on cosmic curvature: implication from updated Hubble diagram of high-redshift standard candles
• Testing cosmic opacity with the combination of strongly lensed and unlensed supernova Ia