Tianlai
A 21-cm Intensity Mapping Experiment
The Tianlai project aims to make a large scale structure survey using the intensity mapping method, in which the 21 cm radiation from neutral hydrogen atoms at mid-redshifts are mapped out with low angular resolution without resolving individual galaxies. The survey will enable detection of the baryon acoustic oscillation (BAO) peaks in the matter power spectrum, which can be used as standard rulers to measure the Hubble expansion rate and angular diameter distance, and these can be used to infer the equation of state of the dark energy.
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