Cosmic Parallax: possibility of detecting anisotropic expansion of the universe by very accurate astrometry measurements

Abstract

Refined astrometry measurements allow us to detect large-scale deviations from isotropy through real-time observations of changes in the angular separation between sources at cosmic distances. This "cosmic parallax" effect is a powerful consistency test of FRW metric and may set independent constraints on cosmic anisotropy. We apply this novel general test to LTB cosmologies with off-center observers and show that future satellite missions such as Gaia might achieve accuracies that would put limits on the off-center distance which are competitive with CMB dipole constraints.

arXiv comment5 pages, 2 figures, accepted by PRL

References in corpus (14)

• A general test of the Copernican Principle
• Direct Measurement of Cosmological Parameters from the Cosmic Deceleration of Extragalactic Objects
• Gamma-Ray Bursts From Neutron Star Phase Transitions
• Confronting Lemaitre-Tolman-Bondi models with Observational Cosmology
• Time drift of cosmological redshifts as a test of the Copernican principle
• On cosmological observables in a swiss-cheese universe
• A Test of the Copernican Principle
• CMB anisotropies seen by an off-center observer in a spherically symmetric inhomogeneous universe
• Living in a Void: Testing the Copernican Principle with Distant Supernovae
• Exploring the Dark Energy Redshift Desert with the Sandage-Loeb Test
• The time evolution of cosmological redshift as a test of dark energy
• Time drift of cosmological redshifts and its variance
• Anisotropic Observations in Universes with Nonlinear Inhomogeneity
• Testing the LCDM model (and more) with the time evolution of the redshift

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• Observational constraints on inhomogeneous cosmological models without dark energy
• Inflation and dark energy from three-forms
• Real-time Cosmology
• 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
• On the Possibility of Anisotropic Curvature in Cosmology
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• Dark energy: investigation and modeling
• Another look at redshift drift and the backreaction conjecture
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• Cosmic Parallax in Ellipsoidal Universe
• Future dark energy constraints from measurements of quasar parallax: Gaia, SIM and beyond
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• The cosmic aberration drift: proposal for a real-time detection of our acceleration through space
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• A Quantitative Framework for Testing the Hubble Tension in a Bianchi Type I Cosmological Background
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