A universal seesaw mechanism in five dimensions
  We show the universal seesaw in the extra dimension setup, where three extra vector-like fields exist in the 5D bulk with heavy masses. We take the framework of the left-right symmetric model. The universal seesaw formula is easily obtained as a replacement of the vector-like mass in 4D case M_i to   2 M_* tan[pi RM_i] (M_*: 5D Planck scale,   M_i: vector-like bulk mass, and   R: compactification radius). The smallness of Dirac neutrino mass can be naturally explained in the 5D setup. We also show the Majorana neutrino case. 
Naoyuki Haba