Geodesic-light-cone coordinates and the Bianchi I spacetime
Geodesic-light-cone coordinates and the Bianchi I spacetime
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DOI：
10.1088/1475-7516/2016/06/008
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发表时间：
2016-02
影响因子：
6.4
通讯作者：
P. Fleury;F. Nugier;G. Fanizza
中科院分区：
文献类型：
--
作者：
P. Fleury;F. Nugier;G. Fanizza
测地线光锥坐标是分析宇宙学模型中光传播和观测的有用工具。在这篇文章中，我们提出了一个详细的，教学的，严格的介绍这个坐标系，探讨其规范的自由度，并强调其利益时，几何光学处于危险之中。然后，我们应用GLC形式主义的均匀和各向异性的比安奇I宇宙学。这个应用不仅仅是一个简单的例子，它（i）使我们能够证明，在一个全局各向异性的宇宙中，引力透镜不影响常数红移表面的适当面积的温伯格猜想被严重违反了;（ii）提供了一个从哈勃图中看到约束宇宙各向同性的新方法的一瞥。
The geodesic-light-cone (GLC) coordinates are a useful tool to analyse light propagation and observations in cosmological models. In this article, we propose a detailed, pedagogical, and rigorous introduction to this coordinate system, explore its gauge degrees of freedom, and emphasize its interest when geometric optics is at stake. We then apply the GLC formalism to the homogeneous and anisotropic Bianchi I cosmology. More than a simple illustration, this application (i) allows us to show that the Weinberg conjecture according to which gravitational lensing does not affect the proper area of constant-redshift surfaces is significantly violated in a globally anisotropic universe; and (ii) offers a glimpse into new ways to constrain cosmic isotropy from the Hubble diagram.