Indecomposable Uq(sl(n)) modules for q(h) =-1 and BRS intertwiners

A class of indecomposable representations of U-q(sl(n)) is considered for q , an even root of unity (q(h) = -1) exhibiting a similar structure as (heig ht h) indecomposable lowest weight Kac-Moody modules associated with chiral conformal field theory. In particular, U-q(sl(n)) counterparts of the Bern ard-Felder BRS operators are constructed for n = 2, 3. For n = 2 a pair of dual d(2)(h) = h-dimensional U-q(sl(2)) modules gives rise to a 2h-dimensio nal indecomposable representation including those studied earlier in the co ntext of tenser-product expansions of irreducible representations. For n = 3 the interplay between the Poincare-Birkhoff-Witt and (Lusztig) canonical bases is exploited in the study of d(3)(h) = h(h+1)(2h+1)/6-dimensional ind ecomposable modules and of the corresponding intertwiners.