A nontrivial solvable noncommutative ϕ^3 model in 4 dimensions

Abstract

We study the quantization of the noncommutative selfdual ϕ^3 model in 4 dimensions, by mapping it to a Kontsevich model. The model is shown to be renormalizable, provided one additional counterterm is included compared to the 2-dimensional case which can be interpreted as divergent shift of the field ϕ. The known results for the Kontsevich model allow to obtain the genus expansion of the free energy and of any n-point function, which is finite for each genus after renormalization. No coupling constant or wavefunction renormalization is required. A critical coupling is determined, beyond which the model is unstable. This provides a nontrivial interacting NC field theory in 4 dimensions.

24 pages, 2 figures. V2: typos fixed

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• Noncommutative gauge theories on ${\mathbb{R}}_{\theta }^2$ as matrix models
• Exact Partition Functions for Gauge Theories on ${\mathbb{R}}_{\lambda }^3$
• Duality covariant quantum field theory on noncommutative Minkowski space
• A Laplacian to compute intersection numbers on ${\bar{\mathcal{M}}}_{g,n}$ and correlation functions in NCQFT
• Nonperturbative evaluation of the partition function for the real scalar quartic QFT on the Moyal plane at weak coupling