Refinements of Kool-Thomas Invariants via Equivariant $K$-theoretic invariants

Abstract

In this article we are defining a refinement of Kool-Thomas invariants of local surfaces via the equivariant $K$-theoretic invariants proposed by Nekrasov and Okounkov. Kool and Thomas defined the reduced obstruction theory for the moduli of stable pairs $\mathcal{P}_{\chi}(X,i_{*}\beta)$ as the degree of the virtual class $\left[\mathcal{P}_{\chi}(S,\beta)\right]^{red}$ after we apply $\tau([pt])^{m}\in H^{*}(\mathcal{P}_{\chi}(X,i_{*}\beta),\mathbb{Z})$. $\tau([pt])$ contain the information of the incidence of a point and a curve supporting a $(\mathcal{F},s)$. $\textbf{Keywords: }$Kool-Thomas invariants, $K$-theoretic invariants, G\"ottsche Shende invariants