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Open strings, simple currents and fixed points

A. N. Schellekens

hep-tharXiv:hep-th/0001198

Abstract

Some applications of simple current techniques and fixed point resolution to theories of open strings are discussed. In addition to a brief review of work presented in two recent papers with L. Huiszoon and N. Sousa, some new results concerning uniqueness of crosscap coefficients are presented, as well as a strange sum rule for the modular matrix implied by the existence of crosscaps.

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