Multiplicative structure of the K-theoretic McKay correspondence for Hilbert scheme of points
- Speaker(s)
- Jakub Koncki
- Affiliation
- IMPAN/UW
- Date
- Jan. 8, 2024, 10:30 a.m.
- Room
- room 4070
- Seminar
- Seminar Algebraic Topology
Hilbert scheme of points in a complex plane is a classical object of study in algebraic geometry. McKay correspondence provides an isomorphism of vector spaces between its K-theory (or cohomology) and the space of symmetric functions, creating a bridge between geometry and combinatorics. Multiplication by a class in the K-theory induces an endomorphism of the space of symmetric functions.
In the cohomology case, compact formulas for such maps were found by Lehn and Sorger. The K-theoretical case was studied by Boissière using torus equivariant techniques. He proved a formula for multiplication by the class of tautological bundle and stated a conjecture for remaining generators of the K-theory of Hilbert scheme. In the talk I will show how torus action simplifies the problem and prove the conjectured formula using restriction to a one-dimensional subtorus.
This is a joint project with M. Zielenkiewicz.