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Title: Perverse cohérent sheaves and quantum loop group

´¡²ú²õ³Ù°ù²¹³¦³Ù:ÌýThe category of equivariant perverse sheaves on the affine Grassmannian has a coherent counterpart, called the coherent Satake category. Cautis and Williams proved for GL and conjectured for other types that this category has a cluster structure. I will speak about constructing certain categorical mutations in all simply-laced types. Our approach is based on relating the coherent Satake category with the category of finite-dimensional modules over the quantum affine group. The bridge between these two categories is provided by the notion of Feigin-Loktev fusion product for modules over the current algebra. In particular, it helps to construct cluster short exact sequences of perverse coherent sheaves using the existence of exact sequences of modules over the quantum affine group.

Location: UQAM PK-5675