The Non - Perturbative SO ( 32 ) Heterotic String
نویسنده
چکیده
The SO(32) heterotic string can be obtained from the type IIB string by gauging a discrete symmetry that acts as (−1) FL 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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