Abstract
Duality between the E 8 × E 8 heterotic string 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 E 8 × E 8 gauge symmetry. By taking a different infinite coupling limit, one can recover the E 8 × E 8 gauge bosons of M-theory, compactified on S 1/ Z 2 . 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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