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hep-th2001★ 76 cited
The Operator Algebra and Twisted KZ Equations of WZW Orbifolds
J. de Boer, M. B. Halpern, N. A. Obers
We obtain the operator algebra of each twisted sector of all WZW orbifolds, including the general twisted current algebra and the algebra of the twisted currents with the twisted a…
hep-th2001
Exact Thresholds and Instanton Effects in String Theory
N. A. Obers, B. Pioline
In this lecture we summarize some recent work on the understanding of instanton effects in string theories with 16 supersymmetries. In particular, we consider F^4 couplings using t…