We construct domain-wall brane models based on the grand-unification group SO(10), generalizing the SU(5) model of Davies, George, and Volkas. Motivated by the Dvali-Shifman proposal for the dynamical localization of gauge bosons, the SO(10) symmetry is spontaneously broken inside the wall. We present two scenarios: in the first, the unbroken subgroup inside the wall is $\mathrm{SU}(5)\times \mathrm{U}(1{)}_X$, and in the second it is the left-right symmetry group $\mathrm{SU}(3)\times \mathrm{SU}(2{)}_L\times \mathrm{SU}(2{)}_R\times U(1{)}_{B-L}$. In both cases we demonstrate that the phenomenologically-correct fermion zero modes can be localized to the wall, and we briefly discuss how the symmetry-breaking dynamics may be extended to induce breaking to the standard model group with subsequent electroweak breaking. Dynamically localized gravity is realized through the type 2 Randall-Sundrum mechanism.

• Received 4 September 2009

DOI:https://doi.org/10.1103/PhysRevD.80.125016