On Springer's correspondence for simple groups of type En (n = 6, 7, 8)
- 1 July 1982
- journal article
- research article
- Published by Cambridge University Press (CUP) in Mathematical Proceedings of the Cambridge Philosophical Society
- Vol. 92 (1) , 65-72
- https://doi.org/10.1017/s0305004100059703
Abstract
Let G be a connected reductive algebraic group over complex numbers. To each unipotent element u ε G (up to conjugacy) and to the unit representation of the group of components of the centralizer of u, Springer (11), (12) associates an irreducible representation of the Weyl group W of G. The tensor product of that representation with the sign representation will be denoted ρu. (This agrees with the notation of (5).) This representation may be realized as a subspace of the cohomology in dimension 2β(u) of the variety of Borel subgroups containing u, where β(u) = dim . For example, when u = 1, ρu is the sign representation of W. The map u → ρu defines an injective map from the set of unipotent conjugacy classes in G to the set of irreducible representations of W (up to isomorphism). Our purpose is to describe this map in the case where G is simple of type Eu (n = 6, 7, 8). (When G is classical or of type F4, this map is described by Shoji (9), (10); the case where G is of type G2 is contained in (11).Keywords
This publication has 8 references indexed in Scilit:
- Green polynomials and singularities of unipotent classesAdvances in Mathematics, 1981
- Some problems in the representation theory of finite Chevalley groupsPublished by American Mathematical Society (AMS) ,1981
- On the springer representations of chevalley groups op type f4Communications in Algebra, 1980
- Induced Unipotent ClassesJournal of the London Mathematical Society, 1979
- Correction to "On the springer representations op the weyl groups of classical algebraic groups"Communications in Algebra, 1979
- Some numerical results on the characters of exceptional Weyl groupsMathematical Proceedings of the Cambridge Philosophical Society, 1978
- A construction of representations of Weyl groupsInventiones Mathematicae, 1978
- Trigonometric sums, green functions of finite groups and representations of Weyl groupsInventiones Mathematicae, 1976