Cosmic structure formation in a flavoured U$left(1right)$ dark sector at small scales. (arXiv:1810.07198v2 [hep-ph] UPDATED)

Cosmic structure formation in a flavoured U$left(1right)$ dark sector at small scales. (arXiv:1810.07198v2 [hep-ph] UPDATED)
<a href="http://arxiv.org/find/hep-ph/1/au:+Balducci_O/0/1/0/all/0/1">Ottavia Balducci</a>, <a href="http://arxiv.org/find/hep-ph/1/au:+Hofmann_S/0/1/0/all/0/1">Stefan Hofmann</a>, <a href="http://arxiv.org/find/hep-ph/1/au:+Kassiteridis_A/0/1/0/all/0/1">Alexis Kassiteridis</a>

In this work we study the footprint of a secluded dark sector with a
U$left(1right)$ gauge symmetry on the formation of cosmic structure at small
scales. A single generation of dark fermions with mass in the TeV range is able
to elegantly solve all small-scale issues of structure formation, while still
being consistent with the cosmological history of the universe. A new
interaction at the MeV scale is introduced for this purpose. As a
generalization we consider multiple generations of fermions as well and show
that such extensions are also cosmologically viable and allow a more flexible
choice of the parameters of the theory.

In this work we study the footprint of a secluded dark sector with a
U$left(1right)$ gauge symmetry on the formation of cosmic structure at small
scales. A single generation of dark fermions with mass in the TeV range is able
to elegantly solve all small-scale issues of structure formation, while still
being consistent with the cosmological history of the universe. A new
interaction at the MeV scale is introduced for this purpose. As a
generalization we consider multiple generations of fermions as well and show
that such extensions are also cosmologically viable and allow a more flexible
choice of the parameters of the theory.

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