Can cosmic parallax distinguish between anisotropic cosmologies?

Michele Fontanini, Eric J. West, Mark Trodden

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


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 nonobservance 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.

Original languageEnglish (US)
Article number123515
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number12
StatePublished - Dec 11 2009


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