Strong lensing systems and galaxy cluster observations as probe to the cosmic distance duality relation

TL;DR

This study tests the cosmic distance duality relation using large-scale structure observations, finding it remains consistent across redshifts within 1.5 sigma, independent of galaxy cluster baryon content.

Contribution

It introduces a model-independent test of the CDDR using strong lensing and galaxy cluster data, confirming its redshift independence.

Findings

CDDR remains redshift independent within 1.5 sigma

Results are independent of galaxy cluster baryon budget

Supports the validity of the CDDR with current data

Abstract

{In this paper, we use large scale structure observations to test the redshift dependence of cosmic distance duality relation (CDDR), $D_{\rm L}(1+z)^{-2}/D_{\rm A}=\eta(z)$}, with $D_{\rm L}$ and $D_{\rm A}$, being the luminosity and angular diameter distances, respectively. In order to perform the test, the following data set are considered: strong lensing systems and galaxy cluster measurements (gas mass fractions). No specific cosmological model is adopted, only a flat universe is assumed. { By considering two $\eta(z)$ parametrizations, It is observed that the CDDR remain redshift independent within $1.5\sigma$ which is in full agreement with other recent tests involving cosmological data}. It is worth to comment that our results are independent of the baryon budget of galaxy clusters.