Enhancons, Fuzzy Spheres and Multi-Monopoles
Abstract
We study the `enhancon', a spherical hypersurface apparently made of D-branes, which arises in string theory studies of large N SU(N) pure gauge theories with eight supercharges. A relation to charge N BPS multi-monopoles is exploited to uncover many of its detailed properties. It is simply a spherical slice through an Atiyah-Hitchin submanifold of the charge N BPS monopole moduli space. In the form of Nahm data, it is built from the N dimensional irreducible representation of SU(2). In this sense the enhancon is a non-commutative sphere, reminiscent of the spherical `dielectric' branes of Myers. Intriguingly, there is a natural suggestion of a candidate dual string theory which captures the physics of the Coulomb branch of the SU(N) gauge theory at large N. It is a new type of matrix string theory, built from N x N matrices satisfying Nahm's equations.Keywords
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