Carmelo will discuss upcoming observations of the early Universe with 21 cm interferometry. They promise to dramatically increase our understanding of the physical processes of the high-redshift intergalactic medium. In particular, dark matter annihilation or decay is expected to produce unambiguous signal that can be finally used to clarify the nature of this elusive dark component.
See Marcos Valdés, Carmelo Evoli, Andrei Mesinger, Andrea Ferrara, Naoki Yoshida, arXiv:1209.2120.