Talk page
Title:
What does the 21-cm signal really measure?
Speaker:
Abstract:
The 21-cm line of hydrogen has a wealth of information about the dark sector of our universe.Its depth during cosmic dawn depends on the thermal state of gas, so it is sensitive to dark-matter annihilation/decays or scattering. Meanwhile, its timing is due to the first galaxy formation, and thus depends on dark-matter clustering at very small scales. In this talk I will demystify the 21-cm signal during cosmic dawn. I will describe a new effective approach to calculating the signal and how it enables us to understand each of the components analytically, highlighting the use of 21-cm for beyond-SM cosmology. If time allows, I will work through a tutorial of the Zeus21 Python package where this model is implemented. It takes seconds to run on a laptop, and does not require any simulation knowledge.
Link:
Workshop: