Possibility of detecting anisotropic expansion of the universe by very accurate astrometry measurements.

摘要: Refined astrometry measurements allow us to detect large-scale deviations from isotropy through real-time observations of changes in the angular separation between sources at cosmic distances. This "cosmic parallax" effect is a powerful consistency test Friedmann-Robertson-Walker metric and may set independent constraints on anisotropy. We apply this novel general Lemaitre-Tolman-Bondi cosmologies with off-center observers show that future satellite missions such as Gaia might achieve accuracies would put limits distance which are competitive microwave background dipole constraints.