Cohomology for infinitesimal unipotent algebraic and quantum groups

Details Cohomology for infinitesimal unipotent algebraic and quantum groups Cohomology for infinitesimal unipotent algebraic and quantum groups

2010-07-20

arxiv.org/abs/1007.3479v3

Mathematics

Representation Theory

18 pages. Some proofs streamlined over previous version. Additional details added to some proofs in Section 5

Scientific paper

In this paper we study the structure of cohomology spaces for the Frobenius kernels of unipotent and parabolic algebraic group schemes and of their quantum analogs. Given a simple algebraic group $G$, a parabolic subgroup $P_J$, and its unipotent radical $U_J$, we determine the ring structure of the cohomology ring $H^\bullet((U_J)_1,k)$. We also obtain new results on computing $H^\bullet((P_J)_1,L(\lambda))$ as an $L_J$-module where $L(\lambda)$ is a simple $G$-module with high weight $\lambda$ in the closure of the bottom $p$-alcove. Finally, we provide generalizations of all our results to the quantum situation.

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