3 papers
math.AG2025
Two dimensional versions of the affine Grassmannian and their geometric description
Andrea Maffei, Valerio Melani, Gabriele Vezzosi
For a smooth affine algebraic group over an algebraically closed field, we consider several two-variables generalizations of the affine Grassmannian , gi…
math.RT2025
The Factorizable Feigin-Frenkel center
Luca Casarin, Andrea Maffei
We prove a factorizable version of the Feigin-Frenkel theorem on the center of the completed enveloping algebra of the affine Kac-Moody algebra attached to a simple Lie algebra at…
math.AG2025
Topological sheaves and spaces of distributions in the global case
Luca Casarin, Andrea Maffei
We extend the theory of fields/distributions developed the paper "A Feigin-Frenkel theorem with n singularities" to a general base scheme. In order to do so we introduce suitable n…