Speaker
Description
The 21cm line from neutral hydrogen is a rare ubiquitous tracer of the cosmic matter distribution, from very high redshift until the present day. The future of large scale structure cosmology -- mapping out the abundance of modes during the cosmic dark ages -- largely depends on getting the 21cm mapping technique to work in other redshift regimes, which has so far proved rather challenging. In this talk, I will summarise recent progress, including strong detections of the signal at low redshift with the MeerKAT telescope, and improved upper limits from the HERA array at higher redshift. I will then review some of the associated challenges, including pointers to recent areas of progress on data analysis methods and possibilities for future experiment building, including in space and on the lunar farside.
