Speaker
Tomo Takahashi
(Saga University)
Description
I discuss how one can probe the primordial Universe by using the neutral hydrogen 21 cm line, particularly focusing on primordial fluctuations. After briefly reviewing the physics of 21cm line, I discuss how the 21cm global signal, such as observed by EDGES, can probe small-scale primordial power spectrum. I also discuss the prospect of probing primordial non-Gaussianities with 21cm line. I argue that the 21 cm line would be a powerful probe of primordial fluctuations.
