Ultralight Dark Matter from the Edge of Field Space

by Mathias Becker

Thursday Dec 11, 2025, 1:30 PM → 2:30 PM Europe/Zurich

4/2-037 - TH meeting room (CERN)

I will present a new framework for ultralight dark matter based on a scalar field that experiences boundaries in field space. Such boundaries give rise to wallions, excitations whose masses are exponentially suppressed yet radiatively stable. After introducing the basic setup, I will discuss how wallions behave in the early universe and how these boundaries may form dynamically.