Dark Matter and Leptogenesis in the Inverse Seesaw
  We study a seesaw-type extension of the Standard Model in which the symmetry group is enlarged by a global U(1). We introduce adequate scalar and fermion representations which naturally explain the smallness of neutrino masses. With the addition of a viable scalar Dark Matter candidate, an original and successful scenario of leptogenesis emerges. 
Francois-Xavier Josse-Michaux and Emiliano Molinaro
hep-ph