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20202023
most citedIntersection cohomology of character varieties for punctured Riemann surfaces

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math.RT2023

Comet-shaped quiver varieties, Weyl group actions, and modified Kostka polynomials

Mathieu Ballandras

We study an algebra spanned by modified Kostka polynomials. Particular structure coefficients of this algebra are interpreted as traces of some Weyl group actions on the intersecti…

math.RT2020

Trivializations of moment maps

Mathieu Ballandras

We study various trivializations of moment maps. First in the general framework of a reductive group acting on a smooth affine variety. We prove that the moment map is a locall…