AbstractIn the 1980s, Vladimir Drinfeld introduced and studied the notion of Yangian Y(g) associated with an arbitrary simple complex Lie algebra g. The Yangian Y(g) is a deformation of U(g[x]), the universal enveloping algebra for the Lie algebra of polynomial currents g[x]. The general definition of Yangian is radically simplified for the classical series A, and it is even more convenient to ...
Abstract:In this first lecture, I will review the Springer theory of equivariant perverse sheaves on graded Lie algebras, mostly due to Lusztig in the 80s and 90s. Lusztig has proven that the equivariant simple perverse sheaves on the graded Lie algebra can be partitioned into Harish-Chandra series, each generated by a cuspidal local system via the procedure of parabolic induction; in addition,...