Renormalisation of Ï^4-theory on noncommutative R^4 in the matrix base
arXiv:hep-th/0401128 · doi:10.1007/s00220-004-1285-2
Abstract
We prove that the real four-dimensional Euclidean noncommutative Ï^4-model is renormalisable to all orders in perturbation theory. Compared with the commutative case, the bare action of relevant and marginal couplings contains necessarily an additional term: an harmonic oscillator potential for the free scalar field action. This entails a modified dispersion relation for the free theory, which becomes important at large distances (UV/IR-entanglement). The renormalisation proof relies on flow equations for the expansion coefficients of the effective action with respect to scalar fields written in the matrix base of the noncommutative R^4. The renormalisation flow depends on the topology of ribbon graphs and on the asymptotic and local behaviour of the propagator governed by orthogonal Meixner polynomials.
64 pages, 63 figures, LaTeX with svjour macros. v2: section on the strategy of the proof added, integration procedure improved so that the initial cut-off can be directly removed, conclusion extended, many typos corrected; to appear in Commun. Math. Phys