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Partition Functions for BPS States of the Non-Critical E8 String

J. A. Minahan, D. Nemeschansky, N. P. Warner

hep-tharXiv:hep-th/9707149

Abstract

We consider the BPS states of the E8 non-critical string wound around one of the circles of a toroidal compactification to four dimensions. These states are indexed by their momenta and winding numbers. We find explicit expressions, Gn, for the momentum partition functions for the states with winding number n. The Gn are given in terms of modular forms. We give a simple algorithm for generating the Gn, and we show that they satisfy a recurrence relation that is reminiscent of the holomorphic anomaly equations of Kodaira-Spencer theory.

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