Absolute neutrino mass as the missing link to the dark sector
  With the KATRIN experiment, the determination of the absolute neutrino mass
scale down to cosmologically favored values has come into reach. We show that
this measurement provides the missing link between the Standard Model and the
dark sector in scotogenic models, where the suppression of the neutrino masses
is economically explained by their only indirect coupling to the Higgs field.
We determine the linear relation between the electron neutrino mass and the
scalar coupling $\lambda_5$ associated with the dark neutral scalar mass
splitting to be $\lambda_5=3.1\times10^{-9}\ m_{\nu_e}/$eV. This relation then
induces correlations among the DM and new scalar masses and their Yukawa
couplings. Together, KATRIN and future lepton flavor violation experiments can
then probe the fermion DM parameter space, irrespective of the neutrino mass
hierarchy and CP phase.
