Orateur(s)  R. TAYLOR  University of Cambridge  Université Paris VII,

Titre  Unipotent Supports and Generalised GelfandGraev Representations (GGGRs) 
Date  25/10/2012 
Horaire  10:30 à 11:30 

Diffusion  
Résume  Abstract: Assume $G$ is a connected reductive algebraic group equipped with a Frobenius endomorphism $F$ defined over a field of good characteristic. To each irreducible character of the finite group $G^F$ Lusztig has associated a canonical $F$stable unipotent conjugacy class of $G$ called the unipotent support of the character.
For each unipotent conjugacy class of $G^F$ Kawanaka has defined a character called a GGGR, (which is a GelfandGraev character when the class contains regular unipotent elements). In this talk we will discuss results concerning the multiplicities of an irreducible character in the GGGRs defined using elements in its unipotent support. 
Salle  11 rue Pierre et Marie Curie  75005 Paris 
Adresse  