A bstract We study some special features of F 24 , the holomorphic c = 12 superconformal field theory (SCFT) given by chiral free fermions. construct eight different Lie superalgebras “physical” states a superstring compactified on and we prove that they all have structure Borcherds-Kac-Moody superalgebras. This produces family new examples such The models depend choice an $$ \mathcal{N} <mml:m...

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