Cosmic Parallax: possibility of detecting anisotropic expansion of the universe by very accurate astrometry measurements

Details Cosmic Parallax: possibility of detecting anisotropic expansion of the universe by very accurate astrometry measurements Cosmic Parallax: possibility of detecting anisotropic expansion of the universe by very accurate astrometry measurements

2008-09-22

arxiv.org/abs/0809.3675v3

Phys.Rev.Lett.102:151302,2009

Astronomy and Astrophysics

Astrophysics

5 pages, 2 figures, accepted by PRL

Scientific paper

10.1103/PhysRevLett.102.151302

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 of FRW metric and may set independent constraints on cosmic anisotropy. We apply this novel general test to LTB cosmologies with off-center observers and show that future satellite missions such as Gaia might achieve accuracies that would put limits on the off-center distance which are competitive with CMB dipole constraints.

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