Unification of Gravity with Internal Interactions: the SO(2,16) Scheme Revisited

Abstract: The starting point of the present work is the observation that the tangent group of a curved manifold need not have the same dimension as the manifold itself. We use this fact to construct Conformal Gravity and its noncommutative (Fuzzy) counterpart as gauge theories, and then to unify both with internal gauge interactions. Specifically, we present a scheme in which conformal gravity, based on gauging the SO(2,4) group, and fuzzy gravity, based on gauging the SO(1,5)$\times$U(1), are unified with SO(10) internal interactions through the parent group SO(2,16), and we work through the resulting spontaneous symmetry breakings and fermion content in detail. We also discuss the low-energy phenomenology of the scheme, including cosmic-string gravitational-wave signals, and close with a brief outlook: a candidate minimal unification group, a dark-matter candidate suggested by the construction, and the ghost problem common to higher-derivative gravity theories of this type.