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Bound States of Type I' D-particles and Enhanced Gauge Symmetry

David A. Lowe

hep-tharXiv:hep-th/9702006

Abstract

Duality between the E8 x E8 heterotic string and Type I' theory predicts a tower of D(irichlet)-particle bound states corresponding to perturbative heterotic string states. In the limit of infinite Type I' coupling, some of these bound states become massless, giving rise to enhanced E8 x E8 gauge symmetry. By taking a different infinite coupling limit, one can recover the E8 x E8 gauge bosons of M-theory, compactified on S1/Z2. In this paper we use the matrix model description of the D-particle dynamics to study these bound states. We find results consistent with the chain of dualities and clarify a number of issues that arise in the application of the matrix mechanics to this system.

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