BKM Lie superalgebras from dyon spectra in Z N CHL orbifolds for composite N


We show that the generating function of electrically charged 1 2 -BPS states in N = 4 supersymmetric CHL ZN orbifolds of the heterotic string on T 6 are given by multiplicative η-products. The η-products are determined by the cycle shape of the corresponding symplectic involution in the dual type II picture. This enables us to complete the construction of… (More)

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