3 papers
hep-th2003
Twisted Open Strings from Closed Strings: The WZW Orientation Orbifolds
M. B. Halpern, C. Helfgott
Including {\it world-sheet orientation-reversing automorphisms} in the orbifold program, we construct the operator algebras and twisted KZ systems of the genera…
hep-th2002
The Outer-Automorphic WZW Orbifolds on so(2n), including Five Triality Orbifolds on so(8)
O. Ganor, M. B. Halpern, C. Helfgott +1
Following recent advances in the local theory of current-algebraic orbifolds we present the basic dynamics - including the {\it twisted KZ equations} - of each twisted sector of al…
hep-th1993
Flat Connections and Non-Local Conserved Quantities in Irrational Conformal Field Theory
M. B. Halpern, N. A. Obers
Irrational conformal field theory (ICFT) includes rational conformal field theory as a small subspace, and the affine-Virasoro Ward identities describe the biconformal correlators…