CBC zero modes are Majorana while free nonzero KK modes form Dirac fermions via accidental U(1); an extended seesaw then sources LNV from bulk CBC-chiral interactions rather than the Majorana mass.
Seesaw in the bulk
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abstract
A five-dimensional seesaw framework is analyzed with the lepton-number-violating propagator of bulk right-handed neutrinos. That can bypass summing up the effects of heavy Majorana particles whose masses and wavefunctions are not exactly known. The propagator method makes it easier to evaluate the seesaw-induced neutrino mass for various boundary conditions of bulk neutrinos and in a general background geometry, including the warped extra dimension. It is also found that the higher-dimensional seesaw gives a natural framework for the inverse seesaw suppression of low-energy neutrino masses.
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Conjugate Boundary Conditions, Kaluza-Klein Fermions, and an Extended Seesaw Model
CBC zero modes are Majorana while free nonzero KK modes form Dirac fermions via accidental U(1); an extended seesaw then sources LNV from bulk CBC-chiral interactions rather than the Majorana mass.