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In this work we study the footprint of a secluded dark sector with aU$\left(1\right)$ gauge symmetry on the formation of cosmic structure at smallscales. A single generation of dark fermions with mass in the TeV range is ableto elegantly solve all small-scale issues of structure formation, while stillbeing consistent with the cosmological history of the universe. A newinteraction at the MeV scale is introduced for this purpose. As ageneralization we consider multiple generations of fermions as well and showthat such extensions are also cosmologically viable and allow a more flexiblechoice of the parameters of the theory.

Cosmic structure formation in a flavoured U$\left(1\right)$ dark sector at small scales