Abstract
We study the validity of cosmic distance dualityrelation between angular diameter and luminosity distances. Totest this duality relation we use the latest Union2 Supernovae TypeIa (SNe Ia) data for estimating the luminosity distance. The estimationof angular diameter distance comes from the samples of galaxyclusters (real and mock) and FRIIb radio galaxies. We parameterize the distanceduality relation as a function of redshift in six different ways.Our results rule out some of the parameterizations significantly.
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