Instantons, finite N=2 Sp(N) theories and the AdS/CFT correspondence
Abstract
We examine ADHM multi-instantons in the conformal N=2 supersymmetric Sp(N) gauge theory with one anti-symmetric tensor and four fundamental hypermultiplets. We argue that the ADHM construction and measure can also be deduced from purely field theoretic considerations and also from the dynamics of D-instantons in the presence of D3-branes, D7-branes and an orientifold O7-plane. The measure then admits a large-N saddle-point approximation where the D3-branes disappear but the background is changed to AdS5 x S5/Z2, as expected on the basis of the AdS/CFT correspondence. The large-N measure displays the fractionation of D-instantons at the singularity S3 in S5/Z2 and is described for instanton number k by a certain O(k) matrix model.
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