论文标题
红移和量规选择
Redshift and gauge choice
论文作者
论文摘要
我们表明，特定的量规选择非常接近定义框架，其首选观察者看到无偶极子CMB。在该规格中，度量标准是量表因子的产物，具体取决于所有时空坐标，也是具有无扩展的地理序列矢量场的度量。这种设置促进了红移和其他距离措施的计算，并解释了为什么尽管不均匀性，我们仍可以具有高度各向同的CMB。
We show that a specific gauge choice comes extremely close to defining a frame whose preferred observers see a dipole-free CMB. In this gauge the metric is the product of a scale factor depending on all spacetime coordinates, and a metric featuring an expansion-free geodesic timelike vector field. This setup facilitates the computation of redshift and other distance measures and explains why we can have a highly isotropic CMB despite large inhomogeneities.
