Can Cosmic Parallax Distinguish Between Anisotropic Cosmologies?

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 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.

24 pages, 6 figures

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Cited by in corpus (16)

• Anisotropic Universe Models in f(T) Gravity
• Testing the Isotropy of the Universe with Type Ia Supernovae
• Distinguishing Between Void Models and Dark Energy with Cosmic Parallax and Redshift Drift
• Locally Rotationally Symmetric Bianchi Type-I cosmological model in $f(T)$ gravity: from early to Dark Energy dominated universe
• Bianchi I meets the Hubble diagram
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• Optical drift effects in general relativity
• A covariant treatment of cosmic parallax
• Direction and redshift drifts for general observers and their applications in cosmology
• Cosmic Parallax in Ellipsoidal Universe
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• Algebraic symmetries of the observables on the sky: Variable emitters and observers
• A Quantitative Framework for Testing the Hubble Tension in a Bianchi Type I Cosmological Background