| This thesis presents experimental progress towards constraining cosmology with 21cm radio observations. In particular, dark energy can be constrained by mapping out the cosmic web on large scales (> 10 Mpc) to see the evolution of the baryon acoustic oscillation (BAO) scale. 21cm Hydrogen has been detected at redshift 0.8 in cross-correlation using the Green Bank Telescope. The Pittsburgh Cylinder Prototype Telescope was built to investigate the use of a modern cylindrical paraboloid interferometer as a survey instrument and its first results are presented. |
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