2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/182916We show that the effective dynamics of matter fields coupled to 3d quantum gravity is described after integration over the gravitational degrees of freedom by a braided non-commutative quantum field theory symmetric under a kappa-deformation of the Poincare group.4 pages, to appear in Phys. Rev. Letters, Proceedings of the conference "Quantum Theory and Symmetries 4" 2005 (Varna, Bulgaria), v2: some clarifications on the Feynman propagator and slight change in titleHigh Energy Physics - TheoryGeneral Relativity and Quantum Cosmologytext