Séminaires : Séminaire d'Algèbre

Equipe(s) : gr,
Responsables :J. Alev, D. Hernandez, B. Keller, Th. Levasseur, et S. Morier-Genoud.
Email des responsables : Jacques Alev <jacques.alev@univ-reims.fr>, David Hernandez <david.hernandez@imj-prg.fr>, Bernhard Keller <bernhard.keller@imj-prg.fr>, Thierry Levasseur <Thierry.Levasseur@univ-brest.fr>, Sophie Morier-Genoud <sophie.morier-genoud@imj-prg.fr>
Salle : 001
Adresse :IHP


Orateur(s) Laura FEDELE - Paris,
Titre Generators for quantum finite W-algebras in type A
Horaire14:00 à 15:00
RésumeA major contribution to the theory of quantum finite W-algebras in type A comes from the work of J. Brundan and A. Kleshchev who, investigating the relationship between W-algebras and Yangians, achieved important results concerning both their structure and their representation theory. In this framework, for a quantum finite W-algebra in type A, associated to any nilpotent element and arbitrary good grading, we can construct a matrix of Yangian type L(z) which encodes its generators and relations, generalizing the results of A. De Sole, V. Kac and D. Valeri for classical affine W-algebras. We can then express L(z) in a nicer form: when the good grading is associated to a pyramid that is aligned to the right, we use a recursive formula to explicitly construct a matrix W(z) which provides us with a finite set of generators for the W-algebra satisfying Premet's conditions, and prove that the matrix L(z) can be obtained as a generalized quasideterminant of W(z). Finally, we explain how to generalize these results to an arbitrary good grading (and an arbitrary choice of an isotropic subspace), using fundamental results about the structure of quantum finite W-algebras due to W.L. Gan and V. Ginzburg, and J. Brundan and S. Goodwin. This is a joint work with A. De Sole and D. Valeri.