Instantons on Noncommutative R^4 and Projection Operators

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  • 8 December 1999
Abstract
I study noncommutative version of ADHM construction of instantons, which was proposed by Nekrasov and Schwarz. Noncommutative R^4 is described as algebra of operators acting in Fock space. In ADHM construction of instantons, one looks for zero-modes of Dirac-like operator. The feature peculiar to noncommutative case is that these zero-modes project out some states in Fock space. I clarify the mechanism of these projections when the gauge group is U(1). I also construct some zero-modes when the gauge group is U(N) and demonstrate that the projections also occur, and the mechanism is similar to the U(1) case. The physical interpretation of the projection in IIB matrix model is briefly discussed.

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