Cosmic parallax as a probe of late time anisotropic expansion

• Verfasst von: Quercellini, Claudia [VerfasserIn]
• Verfasst von: Amendola, Luca [VerfasserIn]
• Verfasst von: Quartin, Miguel [VerfasserIn]
• Titel: Cosmic parallax as a probe of late time anisotropic expansion
• Verf.angabe: Claudia Quercellini, Paolo Cabella, Luca Amendola, Miguel Quartin, and Amedeo Balbi
• Fussnoten: Gesehen am 13.11.2017
• Titel Quelle: Enthalten in: De.arxiv.org
• Jahr Quelle: 2009
• Band/Heft Quelle: (2009) Artikel-Nummer 0905.4853, 11 Seiten
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1565273699

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.