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Abstract:
The established light neutrino masses and the Dark Matter of the Universe both require physics
beyond the Standard Model for their theoretical explanation. Models that provide a common
framework for these two issues are very attractive. In particular, radiative mechanisms naturally
yield light neutrino masses due to loop suppression factors. These corrections can comprise a
link to the physics of Dark Matter. In most considerations, the Dark Matter relic density is
produced by freeze-out. This thesis contributes to the elds of radiative neutrino masses and
frozen-out Dark Matter. In detail, it is shown that in the Ma-model, right-handed neutrino Dark
Matter can be directly detected by photon exchange at one-loop level. The Zee-Babu-model
is extended such that it enjoys a global symmetry based on baryon and lepton number. This
symmetry generates light neutrino masses and a mass for a stable Dark Matter particle by its
spontaneous breaking. Moreover, this thesis provides a new production mechanism for keV
sterile neutrino Dark Mattetr, which is based on the freeze-in scenario. In particular, keV
sterile neutrino Dark Matter produced by the decay of a frozen-in scalar is investigated.
