Possibility of detecting anisotropic expansion of the universe by very accurate astrometry measurements

• Verfasst von: Quercellini, Claudia [VerfasserIn]
• Verfasst von: Quartin, Miguel [VerfasserIn]
• Verfasst von: Amendola, Luca [VerfasserIn]
• Titel: Possibility of detecting anisotropic expansion of the universe by very accurate astrometry measurements
• Verf.angabe: Claudia Quercellini, Miguel Quartin and Luca Amendola
• Fussnoten: Gesehen am 13.11.2017
• Titel Quelle: Enthalten in: Physical review letters
• Jahr Quelle: 2009
• Band/Heft Quelle: 102(2009,15) Artikel-Nummer 151302, 4 Seiten
• ISSN Quelle: 1079-7114
• DOI: doi:10.1103/PhysRevLett.102.151302
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1565274970

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 the Friedmann-Robertson-Walker metric and may set independent constraints on cosmic anisotropy. We apply this novel general test to Lemaitre-Tolman-Bondi 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 cosmic microwave background dipole constraints.