Distinguishing between void models and dark energy with cosmic parallax and redshift drift

• Verfasst von: Quartin, Miguel [VerfasserIn]
• Verfasst von: Amendola, Luca [VerfasserIn]
• Titel: Distinguishing between void models and dark energy with cosmic parallax and redshift drift
• Verf.angabe: Miguel Quartin and Luca Amendola
• Fussnoten: Gesehen am 13.11.2017
• Titel Quelle: Enthalten in: Physical review / D
• Jahr Quelle: 2010
• Band/Heft Quelle: 81(2010,4) Artikel-Nummer 043522, 17 Seiten
• ISSN Quelle: 1550-2368
• ISSN Quelle: 1089-4918
• DOI: doi:10.1103/PhysRevD.81.043522
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1565272641

Abstract

Two recently proposed techniques, involving the measurement of the cosmic parallax and redshift drift, provide novel ways of directly probing (over a time span of several years) the background metric of the universe and therefore shed light on the dark-energy conundrum. The former makes use of upcoming high-precision astrometry measurements to either observe or put tight constraints on cosmological anisotropy for off-center observers, while the latter employs high-precision spectroscopy to give an independent test of the present acceleration of the universe. In this paper, we show that both methods can break the degeneracy between Lemaître-Tolman-Bondi void models and more traditional dark-energy theories. Using the near-future observational missions Gaia and CODEX we show that this distinction might be made with high confidence levels in the course of a decade.