Argyres-Douglas Theories, Chiral Algebras and Wild Hitchin Characters

Abstract

We use Coulomb branch indices of Argyres-Douglas theories on $S^1\times L(k,1)$ to quantize moduli spaces ${\mathcal{M}}_H$ of wild/irregular Hitchin systems. In particular, we obtain formulae for the "wild Hitchin characters" -- the graded dimensions of the Hilbert spaces from quantization -- for four infinite families of ${\mathcal{M}}_H$, giving access to many interesting geometric and topological data of these moduli spaces. We observe that the wild Hitchin characters can always be written as a sum over fixed points in ${\mathcal{M}}_H$ under the $U(1)$ Hitchin action, and a limit of them can be identified with matrix elements of the modular transform $S{T}^{k}S$ in certain two-dimensional chiral algebras. Although naturally fitting into the geometric Langlands program, the appearance of chiral algebras, which was known previously to be associated with Schur operators but not Coulomb branch operators, is somewhat surprising.

47+20 pages, 3 figures. v2: reference added, misprints corrected. v3: added corrections according to journal referee

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