Probing dark energy with redshift drift

M. Martinelli, S. Pandolfi, C. J. A. P. Martins, P. E. Vielzeuf

Abstract
Future redshift-drift measurements (also known as Sandage-Loeb signal) will be crucial to probe the so called “redshift desert”, thus providing a new tool for cosmological studies. In this paper we quantify the ability of a future measurement of the Sandage-Loeb signal by a CODEX-like spectrograph to constrain a phenomenological parametrization of dynamical dark energy, specifically by obtaining constraints on ω₀ and ω_a. We also demonstrate that if used alongside CMB data, the Sandage-Loeb measurements will be able to break degeneracies between expansion parameters, thus greatly improving cosmological constraints.

Physical Review D
Volume 86, Page 123001_1
December 2012

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