  We consider field-theoretic models of a warped extra dimension with multiple
throats, in which fermions that are singlets of the Standard Model gauge group
propagate in a separate throat from the Standard Model fields, which we call
the sterile throat.
  The singlets mix with Standard Model fields via interactions localized on the
UV brane that connects the two throats. This leads to three, light,
mostly-active, Majorana neutrinos via a higher-dimensional see-saw mechanism,
together with Kaluza-Klein towers of mostly-sterile neutrinos, whose scale is
set by the warp factor in the sterile throat and can be very low if the throat
is deep. We suggest that a model of this kind may explain all the neutrino
data, reconciling the LSND result with astrophysical constraints.
