Can Cosmic Parallax Distinguish Between Anisotropic Cosmologies?

Details Can Cosmic Parallax Distinguish Between Anisotropic Cosmologies? Can Cosmic Parallax Distinguish Between Anisotropic Cosmologies?

2009-05-22

arxiv.org/abs/0905.3727v1

Phys.Rev.D80:123515,2009

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

24 pages, 6 figures

Scientific paper

10.1103/PhysRevD.80.123515

In an anisotropic universe, observers not positioned at a point of special symmetry should observe cosmic parallax - the relative angular motion of test galaxies over cosmic time. It was recently argued that the non-observance of this effect in upcoming precision astrometry missions such as Gaia may be used to place strong bounds on the position of off-center observers in a void-model universe described by the Lemaitre-Tolman-Bondi metric. We consider the analogous effect in anisotropic cosmological models described by an axisymmetric homogeneous Bianchi type I metric and discuss whether any observation of cosmic parallax would distinguish between different anisotropic evolutions.

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