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Two recently proposed techniques, involving the measurement of the cosmicparallax and redshift drift, provide novel ways of directing probing (over atime-span of several years) the background metric of the universe and thereforeshed light on the dark energy conundrum. The former makes use of upcominghigh-precision astrometry measurements to either observe or put tightconstraints on cosmological anisotropy for off-center observers, while thelatter employs high-precision spectroscopy to give an independent test of thepresent acceleration of the universe. In this paper, we show that both methodscan break the degeneracy between LTB void models and more traditional darkenergy theories. Using the near-future observational missions Gaia and CODEX weshow that this distinction might be made with high confidence levels in thecourse of a decade.

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