Argyres-Douglas Theories, Macdonald Indices and Arc Space of Zhu's $C_2$-Algebra

Abstract

In this paper, we relate the MacDonald index of a 4d $\mathcal{N}=2$ SCFT with the Hilbert series of the arc space of the Zhu's $C_2$-algebra of the corresponding Schur VOA. Using this, we conjecture a simple formula for the MacDonald index of $(A_1,D_{2n+1})$ Argyres-Douglas theory. We perform checks of the formula against the known Schur limits and RG flows. To match the Schur limit, we prove new $q$-series identities.

arXiv comment67 Pages, included discussion on classical freeness, corrected statement of main theorem