2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/205581We argue that quantum gravity theories that carry a Lie algebraic modification of the Poincare' and Heisenberg algebras inevitably provide inhomogeneities that may serve as seeds for cosmological structure formation. Furthermore, in this class of theories one must expect a strong polarisation and spin dependence of various quantum-gravity effects.Awarded an "honourable mention" in the 2007 Gravity Research Foundation Essay CompetitionGeneral Relativity and Quantum CosmologyAstrophysicsHigh Energy Physics - Phenomenologytext