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Astrophysics > Cosmology and Nongalactic Astrophysics

Title: Distinguishing Between Void Models and Dark Energy with Cosmic Parallax and Redshift Drift

Abstract: Two recently proposed techniques, involving the measurement of the cosmic parallax and redshift drift, provide novel ways of directing 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 LTB 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.
Comments: Corrections made (regarding, e.g., Gaia measurements), one table and some references added. 17 pages, 10 figures, 3 tables, submitted to PRD
Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
Journal reference: Phys.Rev.D81:043522,2010
DOI: 10.1103/PhysRevD.81.043522
Report number: HD-THEP-09-21
Cite as: arXiv:0909.4954 [astro-ph.CO]
  (or arXiv:0909.4954v2 [astro-ph.CO] for this version)

Submission history

From: Miguel Quartin [view email]
[v1] Sun, 27 Sep 2009 21:20:49 GMT (826kb,D)
[v2] Wed, 23 Dec 2009 04:06:36 GMT (854kb,D)