The non-perturbative SO(32) heterotic string
نویسندگان
چکیده
منابع مشابه
The Non - Perturbative SO ( 32 ) Heterotic String
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 ...
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Recent interest in superstring unified field theories has been sparked by the discovery of Green and Schwarz' that nonorientable (type I) open and closed superstrings with N = 1 supersymmetry are finite and free of anomalies if the gauge group is SO(32). Previously the only consistent, anomaly-free3 superstring theory was that of orientable (type II) N = 2 supersymmetric closed strings. The new...
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ژورنال
عنوان ژورنال: Physics Letters B
سال: 1999
ISSN: 0370-2693
DOI: 10.1016/s0370-2693(99)00802-3