Exact N=4 Supersymmetric Low-Energy Effective Action in N=4 Super-Yang-Mills Theory
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We review a recent progress in constructing the low-energy effective action of N=4 SYM theory. This theory is formulated in terms of N=2 harmonic superfields corresponding to N=2 vector multiplet and hypermultiplet. Such a formulation possesses the manifest N=2 supersymmetry and an extra hidden on-shell supersymmetry. Exploring the hidden N=2 supersymmetry we proved that the known non-holomorphic potentials of the form ln W ln \bar{W} can be explicitly completed by the appropriate hypermultiplet-dependent terms to the entire N=4 supersymmetric form. The non-logarithmic effective potentials do not admit an N=4 completion and, hence, such potentials cannot occur in N=4 supersymmetric theory. As a result we obtain the exact N=4 supersymmetric low-energy effective action in N=4 SYM theory.
LaTeX, 9 pages; Contribution to the Proceedings of the Third Sakharov Conference in Physics (Moscow, Lebedev Physical Institute, June 24-29, 2002)
LaTeX, 9 pages; Contribution to the Proceedings of the Third Sakharov Conference in Physics (Moscow, Lebedev Physical Institute, June 24-29, 2002)