标题： 观测宇宙学与宇宙距离对偶关系 显示英文标题

标题： Observational cosmology and the cosmic distance-duality relation

摘要： 我们研究了角直径距离和光度距离之间的宇宙距离对偶关系的有效性。为了检验这一对偶关系，我们使用了最新的Union2型超新星Ia（SNe Ia）数据来估算光度距离。角直径距离的估算来源于星系团（真实和模拟）以及FRIIb射电星系的样本。我们将距离对偶关系以四种不同的方式参数化为红移的函数，发现假设球形等温$\beta$模型的模拟数据集并不符合距离对偶关系，而假设椭圆$\beta$模型的真实数据集则符合。 显示英文摘要

摘要： We study the validity of cosmic distance duality relation between angular diameter and luminosity distances. To test this duality relation we use the latest Union2 Supernovae Type Ia (SNe Ia) data for estimating the luminosity distance. The estimation of angular diameter distance comes from the samples of galaxy clusters (real and mock) and FRIIb radio galaxies. We parameterize the distance duality relation as a function of redshift in four different ways and we find that the mock data set, which assumes a spherical isothermal $\beta$ model for the galaxy clusters does not accommodate the distance duality relation while the real data set which assumes elliptical $\beta$ model does.