Massive gravitons trapped inside a hypermonopole

(eng) We propose a regular classical field theory realisation of the Dvali–Gabadadze–Porrati mechanism by considering our universe to be the four-dimensional core of a seven-dimensional 't Hooft–Polyakov hypermonopole. We show the existence of metastable gravitons trapped in the core. Their mass spectrum is discrete, positive definite, and computed for various values of the field coupling constants: the resulting Newton gravity law is seven-dimensional at small and large distances but can be made four-dimensional on intermediate length scales. There is no need of a cosmological constant in the bulk, the spacetime is asymptotically flat and of infinite volume in the extra-dimensions. Confinement is achieved through the local positive curvature of the extra-dimensions induced by the monopole-forming fields and for natural values of the coupling constants of order unity.