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To solve the hierarchy problem, extra-dimensional models must explain why thenew dimensions stabilize to the right size, and the known mechanisms for doingso require bulk scalars that couple to the branes. Because of these couplingsthe energetics of dimensional stabilization competes with the energetics of theHiggs vacuum, with potentially observable effects. These effects areparticularly strong for one or two extra dimensions because the bulk-Higgscouplings can then be super-renormalizable or dimensionless. Experimental reachfor such extra-dimensional Higgs `portals' are stronger than for gravitationalcouplings because they are less suppressed at low-energies. We compute howHiggs-bulk coupling through such a portal with two extra dimensions back-reactsonto properties of the Higgs boson. When the KK mass is smaller than the Higgsmass, mixing with KK modes results in an invisible Higgs decay width,missing-energy signals at high-energy colliders, and new mechanisms of energyloss in stars and supernovae. Astrophysical bounds turn out to be complementaryto collider measurements, with observable LHC signals allowed by existingconstraints. We comment on the changes to the Higgs mass-coupling relationshipcaused by Higgs-bulk mixing, and how the resulting modifications to the runningof Higgs couplings alter vacuum-stability and triviality bounds.

Bulk Stabilization, the Extra-Dimensional Higgs Portal and Missing Energy in Higgs Events