Invariant prime ideals in quantizations of nilpotent Lie algebras

Details Invariant prime ideals in quantizations of nilpotent Lie algebras Invariant prime ideals in quantizations of nilpotent Lie algebras

2009-05-06

arxiv.org/abs/0905.0852v2

Mathematics

Quantum Algebra

25 pages, AMS-Latex; v.2 minor changes, corrected typos;

Scientific paper

De Concini, Kac and Procesi defined a family of subalgebras U^w_+ of a quantized universal enveloping algebra U_q(g), associated to the elements of the corresponding Weyl group W. They are deformations of the universal enveloping algebras U(n_+ \cap Ad_w(n_-)) where n_\pm are the nilradicals of a pair of dual Borel subalgebras. Based on results of Gorelik and Joseph and an interpretation of U^w_+ as quantized algebras of functions on Schubert cells, we construct explicitly the H invariant prime ideals of each U^w_+ and show that the corresponding poset is isomorphic to W^{\leq w}, where H is the group of group-like elements of U_q(g). Moreover, for each H-prime of U^w_+ we construct a generating set in terms of Demazure modules related to fundamental representations.

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