Torus orbits on homogeneous varieties and Kac polynomials of quivers

Abstract

In this paper we prove that the counting polynomials of certain torus orbits in products of partial flag varieties coincides with the Kac polynomials of supernova quivers, which arise in the study of the moduli spaces of certain irregular meromorphic connections on trivial bundles over the projective line. We also prove that these polynomials can be expressed as a specialization of Tutte polynomials of certain graphs providing a new way to compute them. We also discuss connections with the Gel’fand–MacPherson correspondence.