THE TIANLAI PROJECT: A 21CM COSMOLOGY EXPERIMENT

In my talk at the 2nd Galileo-Xu Meeting, I presented several different topics in 21cm cosmology for which I have done research. These includes the 21cm signature of the first stars1,2, the 21cm signal from the IGM and minihalos3, effect of dark matter annihilations on 21cm signal4, the 21cm forest by ionized/neutral region5, and the 21cm forest by minihalo and earliest galaxies6,7. In this conference proceeding I shall not repeat these discussions, but instead focus on the last part of my talk, i.e. the Tianlai project, an experiment effort on low redshift 21cm intensity mapping observation for dark energy measurements.