2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/199525The curvature on codimension-two and higher branes is not regular for arbitrary matter sources. Nevertheless, the low-energy theory for an observer on such a brane should be well-defined and independent to any regularization procedure. This is achieved via appropriate classical renormalization of the brane couplings, and leads to a natural hierarchy between standard model couplings and couplings to gravity.4 pages, PASCOS-07 conference proceedings, 2-7 July 2007, Imperial CollegeHigh Energy Physics - Theorytext