Speaker
Mathias Becker
(University of Padova)
Description
I will present a new framework for generating 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, how these boundaries can form dynamically, and which cosmological or laboratory probes could be sensitive to them.
Authors
Francesco D'Eramo
(Istituto Nazionale di Fisica Nucleare)
Mathias Becker
(University of Padova)
Ville Vaskonen
(INFN Padova and KBFI Tallinn)