Constraints on Distance Duality Relation from Sunyaev Zel'dovich Effect and Chandra X-ray measurements

TL;DR

This paper uses Sunyaev Zel'dovich and X-ray measurements of galaxy clusters to test the distance duality relation, finding no significant deviations and providing constraints consistent with standard cosmology.

Contribution

It offers new independent constraints on the distance duality relation using cluster data, improving tests of cosmological models without relying on specific assumptions.

Findings

The ratio η = D_L/D_A(1+z)^2 is 0.97±0.03 from cluster data.

The combined cluster and supernova data give η=1.01±0.07.

No evidence found for violations of the distance duality relation.

Abstract

We demonstrate that the recent measurements of the angular diameter distance of 38 cluster of galaxies using Chandra X-ray data and radio observations from the OVRO and BIMA interferometric arrays place new and independent constraints on deviations in the duality relation between angular and luminosity distances. Using only cluster data, we found that the ratio between the two distances defined as $\eta = D_L/D_A(1+z)^2.$ is bound to be $\eta=0.97\pm0.03$ at 68% c.l. with no evidence for distance duality violation. Comparing the cluster angular diameter distance data with luminosity distance data from type Ia Supernovae, we obtain the model independent constraint $\eta=1.01\pm0.07$ at 68% c.l.. Those results provide an useful check for the cosmological concordance model and for the presence of systematics in SN-Ia and clusters data.