*-TREK: The One-Loop N=4 Noncommutative SYM Action

Details *-TREK: The One-Loop N=4 Noncommutative SYM Action *-TREK: The One-Loop N=4 Noncommutative SYM Action

2000-08-27

arxiv.org/abs/hep-th/0008205v2

Nucl.Phys. B614 (2001) 279-304

Physics

High Energy Physics

High Energy Physics - Theory

30 pages AMSLaTeX using JHEP.cls (22 pages if REVTeX4), 2 eps figures. dnmacs is optional. v2: minor typos corrected. Appendix

Scientific paper

10.1016/S0550-3213(01)00401-1

We investigate N=4 noncommutative super Yang-Mills (SYM) theory. We compute the one-loop four gauge boson scattering amplitude on parallel Dp-branes, and find the corresponding contribution to the noncommutative SYM one-loop action in a momentum expansion. The result is somewhat surprising. We find that while the planar diagram can be written using the usual *-product, the contributions from nonplanar diagrams in general involve additional structure beyond the *-product, arising from the nontrivial worldsheet correlations surviving the field theory limit. To each nonplanar diagram, depending on the number n of external vertex operator insertions on each boundary, there is a corresponding *_n n-ary operation. We further find that it is no longer possible to write down an off-shell gauge invariant one-loop effective action using the noncommutative field strength defined at tree-level.

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