Loading Events

Vector bundles, valuations, tropical linear spaces and matriods

SEMINARS: HARVARD-MIT COMBINATORICS

When: April 12, 2023
4:15 pm - 5:15 pm
Where: Science Center 232
Speaker: Kiumars Kaveh - University of Pittsburgh

Torus equivariant rank r vector bundles on a toric variety (toric vector bundles) were famously classified by Klyachko (1989) using certain combinatorial data of compatible filtrations in an r-dimensional vector space E. This data can be thought of as a higher rank generalization of an (integer-valued) piecewise linear function. In this talk, we give interpretations of Klyachko data in terms of valuations with values in a certain meet-join lattice as well as points on a tropical linear space. Since tropical linear spaces correspond to linear matroids, this point of view leads us to introduce the notion of a “matroidal vector bundle”, a generalization of toric vector bundles to general matroids (possibly non-representable). The talk focuses on the combinatorial side of the story and I will give a brief review of toric varieties at the beginning. This is a work in progress with Chris Manon (Kentucky).
=======================================================

For information about the Combinatorics Seminar, please visit…

http://math.mit.edu/seminars/combin/