Matching the BPS Spectra of Heterotic - Type I - Type I' Strings

Abstract

We give a detailed discussion of the matching of the BPS states of heterotic, type I and type I' theories in d=9 for general backgrounds. This allows us to explicitly identify these (composite) brane states in the type I' theory that lead to gauge symmetry enhancement at critical points in moduli space. An example is the enhancement of $SO(16)\times SO(16)$ to $E_8\times E_8$.

11 pages; minor typos in eq. (3), (4) and on page 9 have been corrected; two footnotes taking into account additional references have been added; version to appear in Physics Letters B

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