Perverse sheaves and modular representation theory

Daniel Juteau (1) , Carl Mautner (2) , Geordie Williamson (3)

1 LMNO - Laboratoire de Mathématiques Nicolas Oresme
2 Mathematics Department [San Marcos TX]
3 MI - Mathematical Institute [Oxford]

This paper is an introduction to the use of perverse sheaves with positive characteristic coefficients in modular representation theory. In the first part, we survey results relating singularities in finite and affine Schubert varieties and nilpotent cones to modular representations of reductive groups and their Weyl groups. The second part is a brief introduction to the theory of perverse sheaves with an emphasis on the case of positive characteristic and integral coefficients. In the final part, we provide some explicit examples of stalks of intersection cohomology complexes with integral or positive characteristic coefficients in nilpotent cones, mostly in type A. Some of these computations might be new.

Mots clés: intersection cohomology; Modular representation theory; perverse sheaves; intersection cohomology.

Domaines: Théorie des représentations [math.RT]; Géométrie algébrique [math.AG]

Daniel Juteau, Carl Mautner, Geordie Williamson. Perverse sheaves and modular representation theory. Séminaires et congrès, 2012, 24-II, pp.313-350. ⟨hal-00354963⟩