论文标题
通过距离双重性关系测试宇宙不透明度的失败
The failure of testing for cosmic opacity via the distance-duality relation
论文作者
论文摘要
光度距离$ d_l $与角直径距离$ d_a $之间的距离划分关系（DDR）被视为测试宇宙不透明度的强大工具，独立于任何宇宙学模型。它是由许多作者应用的，他们主要证实了其有效性，并报告了宇宙的不透明度。然而，彻底的分析表明，将DDR应用于宇宙不透明测试是棘手的。由于宇宙不透明度以及当前可用的$ d_a $数据的准确性和不足程度，其适用性受到了极大的限制，因为对$ d_l $数据的非唯一解释。此外，作者通常认为宇宙不透明度是频率独立的，并通过规定的现象学函数在测试中进行参数。这样，他们只证明宇宙不透明度不遵循他们的假设。结果，迄今为止尚无令人信服的宇宙透明度证据。
The distance-duality relation (DDR) between the luminosity distance $D_L$ and the angular diameter distance $D_A$ is viewed as a powerful tool for testing for the opacity of the Universe, being independent of any cosmological model. It was applied by many authors, who mostly confirm its validity and report a negligible opacity of the Universe. Nevertheless, a thorough analysis reveals that applying the DDR in cosmic opacity tests is tricky. Its applicability is strongly limited because of a non-unique interpretation of the $D_L$ data in terms of cosmic opacity and a rather low accuracy and deficient extent of currently available $D_A$ data. Moreover, authors usually assume that cosmic opacity is frequency independent and parametrize it in their tests by a prescribed phenomenological function. In this way, they only prove that cosmic opacity does not follow their assumptions. As a consequence, no convincing evidence of transparency of the universe using the DDR has so far been presented.
