Fragmentation of the axion field may produce the observed DM abundance, which makes it possible for ALP DM to appear with lower values of the axion decay constant than those allowed by the conventional misalignment mechanism. Previously, kinetic misalignment has been proposed to open up this parameter space. We find that for a large range of parameters the field becomes fragmented before kinetic misalignment can take place. Additionally, we demonstrate how the initial velocity necessary for fragmentation can be delivered and study how the process may be constrained or tested via cosmological observables such as BBN and structure formation.
|Collaboration / Activity||DESY / Uni Hamburg|
|First author||Philip Soerensen|