Department of Physics Papers

Document Type

Journal Article

Date of this Version

12-11-2009

Comments

Suggested Citation:
Fontanini, M., E.J. West and M. Trodden. (2009). "Can cosmic parallax distinguish between anisotropic cosmologies?" Physical Review D. 80, 123515.

© 2009 The American Physical Society
http://dx.doi.org/10.1103/PhysRevD.80.123515

Abstract

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.

 

Date Posted: 23 November 2010

This document has been peer reviewed.