Redshift and gauge choice
arXiv:2001.09889 · doi:10.1103/PhysRevD.102.123520
Abstract
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.
arXiv comment15 pages, clarifications and comparisons with other gauges added
References in corpus (17)
- Planck 2018 results. I. Overview and the cosmological legacy of Planck
- On average properties of inhomogeneous fluids in general relativity I: dust cosmologies
- Dark Energy from structure: a status report
- New Perspective on Galaxy Clustering as a Cosmological Probe: General Relativistic Effects
- Cosmic clocks, cosmic variance and cosmic averages
- Can the Acceleration of Our Universe Be Explained by the Effects of Inhomogeneities?
- Accelerated expansion from structure formation
- Is there proof that backreaction of inhomogeneities is irrelevant in cosmology?
- Inhomogeneity and the foundations of concordance cosmology
- How well is our universe described by an FLRW model?
- Cosmic Bulk Flow and the Local Motion from Cosmicflows-2
- General relativistic corrections to -body simulations and the Zel'dovich approximation
- Does the Isotropy of the CMB Imply a Homogeneous Universe? Some Generalised EGS Theorems
- On the relation between the isotropy of the CMB and the geometry of the universe
- A new approach to cosmological structure formation with massive neutrinos
- Viable Gauge Choices in Cosmologies with Non-Linear Structures
- Comments on Backreaction