Speaker
Description
Hydrogen atoms in the universe emit radiation at a wavelength of 21 cm in the radio band, making the 21-cm radiation a powerful tool for exploring the cosmos. 21-cm line observations open a new window for cosmological investigations. By utilizing the 21-cm signal, we can probe the entire evolutionary history of the universe after the recombination epoch and perform a tomographic exploration for the cosmic history. I will discuss the role of 21-cm observations in fundamental physics research, particularly in the exploration of dark matter and dark energy. In the early universe (during the reionization epoch), the 21-cm forest can be employed to simultaneously measure the warm dark matter mass and the cosmic heating history. In the late universe (post-reionization era), intensity mapping surveys can be conducted to measure the equation of state of dark energy. I will also address the technical challenges and solutions in 21-cm cosmology, cosmological signal detection, China's experimental efforts and advancements, and the crucial role that future 21-cm intensity mapping will play in constructing precise cosmological probes of the late universe.
