Quantum linear groups and representations of GLn (Fq) / Jonathan Brundan, Richard Dipper, Alexander Kleshchev.

Format:

Book

Author/Creator:

Brundan, Jonathan, 1970- author.

Dipper, Richard, author.

Kleshchëv, A. S. (Aleksandr Sergeevich), author.

Series:

Memoirs of the American Mathematical Society ; no. 706.

Memoirs of the American Mathematical Society, 0065-9266 ; number 706

Language:

English

Subjects (All):

Linear algebraic groups.

Representations of groups.

Group schemes (Mathematics).

Physical Description:

1 online resource (127 p.)

Edition:

1st ed.

Place of Publication:

Providence, Rhode Island : American Mathematical Society, 2001.

Language Note:

English

Summary:

We give a self-contained account of the results originating in the work of James and the second author in the 1980s relating the representation theory of GL[n(F[q) over fields of characteristic coprime to q to the representation theory of "quantum GL[n" at roots of unity. The new treatment allows us to extend the theory in several directions. First, we prove a precise functorial connection between the operations of tensor product in quantum GL[n and Harish-Chandra induction in finite GL[n. This allows us to obtain a version of the recent Morita theorem of Cline, Parshall and Scott valid in addition for p-singular classes. From that we obtain simplified treatments of various basic known facts, such as the computation of decomposition numbers and blocks of GL[n(F[q) from knowledge of the same for the quantum group, and the non-defining analogue of Steinberg's tensor product theorem. We also easily obtain a new double centralizer property between GL[n(F[[q) and quantum GL[n, generalizing a result of Takeuchi. Finally, we apply the theory to study the affine general linear group, following ideas of Zelevinsky in characteristic zero. We prove results that can be regarded as the modular analogues of Zelevinsky's and Thoma's branching rules. Using these, we obtain a new dimension formula for the irreducible cross-characteristic representations of GL[n(F[q), expressing their dimensions in terms of the characters of irreducible modules over the quantum group.

Contents:

""Contents""; ""Introduction""; ""1 Quantum linear groups and polynomial induction""; ""1.1 Symmetric groups and Hecke algebras""; ""1.2 The g-Schur algebra""; ""1.3 Tensor products and Levi subalgebras""; ""1.4 Polynomial induction""; ""1.5 Schur algebra induction""; ""2 Classical results on GL[sub(n)]""; ""2.1 Conjugacy classes and Levi subgroups""; ""2.2 Harish-Chandra induction and restriction""; ""2.3 Characters and Deligne-Lusztig operators""; ""2.4 Cuspidal representations and blocks""; ""2.5 Howlett-Lehrer theory and the Gelfand-Graev representation""

""3 Connecting GL[sub(n)] with quantum linear groups""""3.1 Schur functors""; ""3.2 The cuspidal algebra""; ""3.3 'Symmetric' and 'exterior' powers""; ""3.4 Endomorphism algebras""; ""3.5 Standard modules""; ""4 Further connections and applications""; ""4.1 Base change""; ""4.2 Connecting Harish-Chandra induction with tensor products""; ""4.3 p-Singular classes""; ""4.4 Blocks and decomposition numbers""; ""4.5 The Ringel dual of the cuspidal algebra""; ""5 The affine general linear group""; ""5.1 Levels and the branching rule from AGL[sub(n)] to GL[sub(n)]""

""5.2 Affine induction operators""""5.3 The affine cuspidal algebra""; ""5.4 The branching rule from GL[sub(n)] to AGL[sub(n�1)""; ""5.5 A dimension formula for irreducibles""; ""Bibliography""

Notes:

"January 2001, volume 149, Number 706 (first of 4 numbers)."

Includes bibliographical references.

Description based on print version record.

ISBN:

1-4704-0297-1