The Inverse Seesaw in Conformal Electro-Weak Symmetry Breaking and
  Phenomenological Consequences
  We study the inverse seesaw mechanism for neutrino masses and
phenomenological consequences in the context of conformal electro-weak symmetry
breaking. The main difference to the usual case is that all explicit fermion
mass terms including Majorana masses for neutrinos are forbidden. All fermion
mass terms arise therefore from vacuum expectation values of suitable scalars
times some Yukawa couplings. This leads to interesting consequences for model
building, neutrino mass phenomenology and the Dark Matter abundance. In the
context of the inverse seesaw we find a favoured scenario with heavy
pseudo-Dirac sterile neutrinos at the TeV scale, which in the conformal
framework conspire with the electro-weak scale to generate keV scale warm Dark
Matter. The mass scale relations provide naturally the correct relic abundance
due to a freeze-in mechanism. We demonstrate also how conformal symmetry
decouples the right-handed neutrino mass scale and effective lepton number
violation. We find that lepton flavour violating processes can be well within
the reach of modern experiments. Furthermore, interesting decay signatures are
expected at the LHC.
