Cosmic Parallax as a probe of late time anisotropic expansion

Abstract

Cosmic parallax is the change of angular separation between pair of sources at cosmological distances induced by an anisotropic expansion. An accurate astrometric experiment like Gaia could observe or put constraints on cosmic parallax. Examples of anisotropic cosmological models are Lemaitre-Tolman-Bondi void models for off-center observers (introduced to explain the observed acceleration without the need for dark energy) and Bianchi metrics. If dark energy has an anisotropic equation of state, as suggested recently, then a substantial anisotropy could arise at $z\lesssim 1$ and escape the stringent constraints from the cosmic microwave background. In this paper we show that such models could be constrained by the Gaia satellite or by an upgraded future mission.

9 pages, 7 figures, text extended, figures changed, accepted by PRD

References in corpus (4)

• Cosmic Microwave Background Quadrupole and Ellipsoidal Universe
• Anisotropic perturbations due to dark energy
• A Complete Statistical Analysis for the Quadrupole Amplitude in an Ellipsoidal Universe
• Cosmic Parallax: possibility of detecting anisotropic expansion of the universe by very accurate astrometry measurements

Cited by in corpus (10)

• On the Possibility of Anisotropic Curvature in Cosmology
• Cosmic Parallax in Ellipsoidal Universe
• Redshift drift cosmography for model-independent cosmological inference
• The Hubble Expansion is Isotropic in the Epoch of Dark Energy
• Apparent versus true value of the cosmological constant
• Algebraic symmetries of the observables on the sky: Variable emitters and observers
• Ellipsoidal Universe and Cosmic Shear
• Axial Bianchi I meets drifting extragalactic sources
• CMB line-of-sight integrators for nearly-isotropic cosmological models
• Application of the space-based optical interferometer towards measuring cosmological distances of quasars