Speaker
Description
In this talk, I will introduce the Fuzzy Dark Sector (FDS) scenario: a rich, interacting system and candidate for dark matter. This serves as a natural extension of the single-component, non-interacting Fuzzy Dark Matter (FDM) paradigm. Concretely, I will discuss an ultra-light Abelian-Higgs model, with interacting Higgs and dark photon degrees of freedom. In cosmology, the transfer function is characterized by a single scale dependent on the FDS parameters, allowing one to recover the LSS signature of single-field FDM. In contrast, galactic halos present a great diversity, unlike with the universality of single-field FDM, owing to the interaction between fields. This interaction introduces an instability that is not otherwise present for the case of four decoupled scalars. I will comment on the possible primordial production and portals to the Standard Model, and conclude with general lessons applicable to the many possible FDS realizations.