Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1996-08-04
Nucl.Phys. B491 (1997) 635-658
Physics
High Energy Physics
High Energy Physics - Theory
LaTex, 20 pages; misprints corrected, few small additions
Scientific paper
10.1016/S0550-3213(97)00038-2
We reconsider the earlier found solutions of the Knizhnik-Zamolodchikov (KZ) equations describing correlators based on the admissible representations of $A_1^{(1)}$. Exploiting a symmetry of the KZ equations we show that the original infinite sums representing the 4-point chiral correlators can be effectively summed up. Using these simplified expressions with proper choices of the contours we determine the duality (braid and fusion) transformations and show that they are consistent with the fusion rules of Awata and Yamada. The requirement of locality leads to a 1-parameter family of monodromy (braid) invariants. These analogs of the ``diagonal'' 2-dimensional local 4-point functions in the minimal Virasoro theory contain in general non-diagonal terms. They correspond to pairs of fields of identical monodromy, having one and the same counterpart in the limit to the Virasoro minimal correlators.
Furlan Paolo
Ganchev Ch. A.
Petkova Valentina B.
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