On the classification of (2,1) heterotic strings
classification
✦ hep-th
keywords
fermionsheteroticstringsalreadybosonscaseschiralchirality
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We classify all untwisted (2,1) heterotic strings. The only solutions are the three already known cases, having massless spectra consisting either of 24 chiral fermions, or of 24 bosons, or of 8 scalars and 8 fermions of each chirality.
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