Matrix $φ^4$ Models on the Fuzzy Sphere and their Continuum Limits

Brian P. Dolan, Denjoe O'Connor, P. Presnajder

Published 2001-09-11Version 1

We demonstrate that the UV/IR mixing problems found recently for a scalar $\phi^4$ theory on the fuzzy sphere are localized to tadpole diagrams and can be overcome by a suitable modification of the action. This modification is equivalent to normal ordering the $\phi^4$ vertex. In the limit of the commutative sphere, the perturbation theory of this modified action matches that of the commutative theory.