Poincare'-Birkhoff-Witt property for bicovariant differential algebras on simple quantum groups
Abstract
We investigate the possibility to construct bicovariant differential calculi on quantum groups SOq(N) and Spq(N) as a quantization of an underlying bicovariant bracket.We show that, opposite to GL(N) and SL(N)-cases, neither of possible graded SO- and Sp- bicovariant brackets (associated with a quasitriangular r-matrices) obey the Jacobi identity when the differential forms are Lie algebra- valued. The absence of a classical Poisson structure gives an indication that differential algebras describing bicovariant differential calculi on quantum orthogonal and symplectic groups are not of Poincar'e- Birkhoff- -Witt type.
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