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The Non-Perturbative SO(32) Heterotic String

C. M. Hull
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Abstract

The SO(32) heterotic string can be obtained from the type IIB string by gauging a discrete symmetry that acts as $(-1)^{F_L}$ on the perturbative string states and reverses the parity of the D-string. Consistency requires the presence of 32 NS 9-branes -- the S-duals of D9-branes -- which give SO(32) Chan-Paton factors to open D-strings. At finite string coupling, there are SO(32) charges tethered to the heterotic string world-sheet by open D-strings. At zero-coupling, the D-string tension becomes infinite and the SO(32) charges are pulled onto the world-sheet, and give the usual SO(32) world-sheet currents of the heterotic string.

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C. M. Hull. 1998-12-22. The Non-Perturbative SO(32) Heterotic String. https://doi.org/10.1016/s0370-2693(99)00802-3

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