Shining Light on the Scotogenic Model: Interplay of Colliders and
  Cosmology
  In the framework of the scotogenic model, which features radiative generation
of neutrino masses, we explore light dark matter scenario. Throughout the paper
we chiefly focus on keV-scale dark matter which can be produced either via
freeze-in through the decays of the new scalars, or from the decays of
next-to-lightest fermionic particle in the spectrum, which is produced through
freeze-out. The latter mechanism is required to be suppressed as it typically
produces a hot dark matter component. Constraints from BBN are also considered
and in combination with the former production mechanism they impose the dark
matter to be light. For this scenario we consider signatures at High Luminosity
LHC and proposed future hadron and lepton colliders, namely FCC-hh and CLIC,
focusing on searches with two leptons and missing energy as a final state.
While a potential discovery at High Luminosity LHC is in tension with limits
from cosmology, the situation greatly improves for future colliders.
