Two-parameter Quantum Group of Exceptional Type G_2 and Lusztig's Symmetries

Details Two-parameter Quantum Group of Exceptional Type G_2 and Lusztig's Symmetries Two-parameter Quantum Group of Exceptional Type G_2 and Lusztig's Symmetries

2006-01-18

arxiv.org/abs/math/0601444v2

Pacific Journal of Mathematics, vol. 230 (2), (2007), 327--346

Mathematics

Quantum Algebra

34 pages. Pacific J. Math. (to appear in its simplified version)

Scientific paper

We give the defining structure of two-parameter quantum group of type G_2 defined over a field {\Bbb Q}(r,s) (with r\ne s), and prove the Drinfel'd double structure as its upper and lower triangular parts, extending an earlier result of [BW1] in type A and a recent result of [BGH1] in types B, C, D. We further discuss the Lusztig's Q-isomorphisms from U_{r,s}(G_2) to its associated object U_{s^{-1},r^{-1}}(G_2), which give rise to the usual Lusztig's symmetries defined not only on U_q(G_2) but also on the centralized quantum group U_q^c(G_2) only when r=s^{-1}=q. (This also reflects the distinguishing difference between our newly defined two-parameter object and the standard Drinfel'd-Jimbo quantum groups). Some interesting (r,s)-identities holding in U_{r,s}(G_2) are derived from this discussion.

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