A test for cosmic distance duality
A test for cosmic distance duality
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DOI：
10.1088/1475-7516/2012/06/022
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发表时间：
2012-01
影响因子：
6.4
通讯作者：
R. Holanda;R. S. Gonçalves;J. Alcaniz
中科院分区：
文献类型：
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作者：
R. Holanda;R. S. Gonçalves;J. Alcaniz
宇宙距离对偶关系（CDDR）的检验是宇宙学和基础物理学的一项重要任务，因为任何对它的违背都是新物理的明证。在本文中，我们提出了一个新的测试CDDR仅使用目前的测量气体质量分数的星系团从Sunyaev-Zeldovich（fSZE）和X射线表面亮度（fX−ray）的观测。我们证明了fX−射线和fSZE观测值之间的关系为fSZE = ηfX−射线，其中η量化了与CDDR的偏差。由于后一种表达是有效的同一对象在一个给定的星系团样本，所提出的方法消除了可能的污染，从不同的系统学误差源和红移的差异参与光度和角直径距离测量。我们将这种独立于宇宙学模型的方法应用于最近的fX射线和fSZE数据，并表明没有发现CDDR的重大违反。
Testing the cosmic distance duality relation (CDDR) constitutes an important task for cosmology and fundamental physics since any violation of it would be a clear evidence of new physics. In this paper, we propose a new test for the CDDR using only current measurements of the gas mass fraction of galaxy clusters from Sunyaev-Zeldovich (fSZE) and X-ray surface brightness (fX−ray) observations. We show that the relation between fX−ray and fSZE observations is given by fSZE = ηfX−ray, where η quantifies deviations from the CDDR. Since this latter expression is valid for the same object in a given galaxy cluster sample, the method proposed removes possible contaminations from different systematics error sources and redshift differences involved in luminosity and angular diameter distance measurements. We apply this cosmological model-independent methodology to the most recent fX−ray and fSZE data and show that no significant violation of the CDDR is found.