Vacuum structure in 5D SO(10) GUT on S1/Z2

We study the vacuum structure in 5D SO(10) grand unified theory (GUT) compactified on S1/Z2 orbifold, where SO(10) is broken into SU(3)xSU(2)xU(1)2 through the boundary conditions. Although a lot of people extended to 6D to avoid massless colored particle, we can show they obtain finite masses by the radiative corrections. In a supersymmetric case, the fermionic partner of the zero-mode can also acquire non-vanishing mass through the SUSY breaking effects, and the gauge coupling unification can be recovered by use of brane localized kinetic terms