Cosmography using strong-lensing systems and cosmic chronometers

Using a new sub-sample of observed strong gravitational lens systems, for the first time, we present the equation for the angular diameter distance in the y-redshift scenario for cosmography and use it to test the cosmographic parameters. In addition, we also use the observational Hubble data from cosmic chronometers and a joint analysis of both data are performed. Among the most important conclusions are that this new analysis for cosmography using strong-lensing systems (SLSs) is equally competitive to constrain the cosmographic parameters as others presented in literature. Additionally, we present the reconstruction of the effective equation of state inferred from our samples, showing that at z = 0 those reconstructions from SLSs and joint analysis are in concordance with the standard model of cosmology.

Automated summary

This study presents the equation for the angular diameter distance in the y-redshift scenario for cosmography for the first time, using a new sub-sample of observed strong gravitational lens systems. The analysis shows that this new approach using strong-lensing systems is equally competitive in constraining cosmographic parameters as other methods presented in literature, and reconstructions from SLSs and joint analysis are in concordance with the standard model of cosmology at z = 0.