Perverse sheaves and quantum Grothendieck rings

Tensor product varieties, perverse sheaves and stability conditions

We show that the space spanned by the class of simple perverse sheaves in [Zh08] without localization is isomorphic to the tensor product of a Verma module with a tensor product of irreducible integrable modules of the quantum enveloping algebra associated with a graph. Under the isomorphism, the simple perverse sheaves get identified with the canonical basis elements of the tensor product module. We also show that the two stability conditions coincide in the localization process in [Zh08], by using supports and singular supports of complexes of sheaves, respectively.

Shuffle algebras and perverse sheaves

We relate shuffle algebras, as defined by Nichols, Feigin-Odesskii and Rosso, to perverse sheaves on symmetric products of the complex line (i.e., on the spaces of monic polynomials stratified by multiplicities of roots). More precisely, we construct an equivalence between: (i) Braided Hopf algebras of a certain type. (ii) Factorizable collections of perverse sheaves on all the symmetric products. Under this eqiuvalence, the Nichols algebra associated to an object V corresponds to the collection of the intersection cohomology extensions of the local systems on the open configuration spaces ass…

关于Lusztig的perverse sheaves的奇异支撑

On singular supports of Lusztig's perverse sheaves

本文证明了Lusztig关于其perverse sheaves的微局部刻画猜想：无环有限quiver的等变简单perverse sheaf是Lusztig的，当且仅当其奇异支撑包含于Lusztig的Lagrangian簇（即preprojective代数的幂零表示簇）。

Cluster algebras and singular supports of perverse sheaves

We propose an approach to Geiss-Leclerc-Schroer's conjecture on the cluster algebra structure on the coordinate ring of a unipotent subgroup and the dual canonical base. It is based on singular supports of perverse sheaves on the space of representations of a quiver, which give the canonical base.

Perverse sheaves on a Loop group and Langlands' duality

An intrinsic construction of the tensor category of finite dimensional representations of the Langlands dual group of G in terms of a tensor category of perverse sheaves on the loop group, LG, is given. The construction is applied to the study of the topology of the affine Grassmannian of G and to establishing a Langlands type correspondence for "automorphic" sheaves on the moduli space of G-bundles.

resurgence 与 perverse sheaves

Resurgence and perverse sheaves

本文提出基于 perverse sheaves 的 resurgence 理论观点，探讨 alien derivatives 在 sheaf-theoretic 卷积下的行为，并讨论扩展 perverse sheaves 以允许无限奇点集的可能方法。