Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2003-04-17
Nucl.Phys. B664 (2003) 371-399
Physics
High Energy Physics
High Energy Physics - Theory
35 pages, 8 figures; typos corrected
Scientific paper
10.1016/S0550-3213(03)00436-X
We show that renormalized non-commutative scalar field theories do not reduce to their planar sector in the limit of large non-commutativity. This follows from the fact that the RG equation of the Wilson-Polchinski type which describes the genus zero sector of non-commutative field theories couples generic planar amplitudes with non-planar amplitudes at exceptional values of the external momenta. We prove that the renormalization problem can be consistently restricted to this set of amplitudes. In the resulting renormalized theory non-planar divergences are treated as UV divergences requiring appropriate non-local counterterms. In 4 dimensions the model turns out to have one more relevant (non-planar) coupling than its commutative counterpart. This non-planar coupling is ``evanescent'': although in the massive (but not in the massless) case its contribution to planar amplitudes vanishes when the floating cut-off equals the renormalization scale, this coupling is needed to make the Wilsonian effective action UV finite at all values of the floating cut-off.
Becchi Carlo
Giusto Stefano
Imbimbo Camillo
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