Can cosmic parallax distinguish between anisotropic cosmologies?

Journal Article · Tue Dec 15 00:00:00 EST 2009 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.80.123515· OSTI ID:21313570

Fontanini, Michele; West, Eric J ^[1]; Trodden, Mark ^[1]

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1. Center for Particle Cosmology, Department of Physics and Astronomy, University of Pennsylvania, Philadelphia Pennsylvania 19104 (United States)

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.

• OSTI ID: 21313570
• Journal Information: Physical Review. D, Particles Fields, Vol. 80, Issue 12; Other Information: DOI: 10.1103/PhysRevD.80.123515; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
ANISOTROPY
AXIAL SYMMETRY
COSMOLOGICAL MODELS
COSMOLOGY
EVOLUTION
GALAXIES
METRICS
UNIVERSE