Measuring baryon acoustic oscillations with future SKA surveys
  The imprint of baryon acoustic oscillations (BAO) in large-scale structure
can be used as a standard ruler for mapping out the cosmic expansion history,
and hence for testing cosmological models. In this article we briefly describe
the scientific background to the BAO technique, and forecast the potential of
the Phase 1 and 2 SKA telescopes to perform BAO surveys using both galaxy
catalogues and intensity mapping, assessing their competitiveness with current
and future optical galaxy surveys. We find that a 25,000 sq. deg. intensity
mapping survey on a Phase 1 array will preferentially constrain the radial BAO,
providing a highly competitive 2% constraint on the expansion rate at z ~ 2. A
30,000 sq. deg. galaxy redshift survey on SKA2 will outperform all other
planned experiments for z < 1.4.
