The standard model on a domain-wall brane?

Understand

We propose a 4+1-dimensional action that is a candidate for realising a standard-model-like effective theory for fields dynamically localised to a domain-wall brane.

• Our construction is based in part on the conjecture that the Dvali-Shifman mechanism for dynamically localising gauge bosons works correctly in 4+1-d.
• Assuming this to be so, we require the gauge symmetry to be SU(5)in the bulk, spontaneously breaking to SU(3)xSU(2)xU(1) inside the domain wall, thus dynamically localising the standard model gauge bosons provided that the SU(5) theory in the bulk exhibits confinement.
• The wall is created jointly by a real singlet-Higgs field eta configured as a kink, and an SU(5) adjoint-Higgs field chi that takes nonzero values inside the wall.