Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Wall-crossing and operator ordering for 't Hooft operators in N=2 gauge
  theories   We study half-BPS 't Hooft line operators in 4d $\mathcal{N}=2$ $U(N)$ gauge
theories on $S^1\times \mathbb{R}^3$ with an $\Omega$-deformation. The recently
proposed brane construction of 't Hooft operators shows that non-perturbative
contributions to their correlator are identified with the Witten indices of
quiver supersymmetric quantum mechanics. For the products of minimal 't Hooft
operators, a chamber in the space of Fayet-Iliopoulos parameters in the quantum
mechanics corresponds to an ordering of the operators inserted along a line.
These considerations lead us to conjecture that the Witten indices can be read
off from the Moyal products of the expectation values of the minimal 't Hooft
operators, and also that wall-crossing occurs in the quantum mechanics only
when the ordering of the operators changes. We confirm the conjectures by
explicitly computing the Witten indices for the products of two and three
minimal 't Hooft operators in all possible chambers.

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The categories of this paper are: patt-sol
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The categories of this paper are: bayes-an
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The categories of this paper are: q-fin
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The categories of this paper are: quant-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: mtrl-th
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The categories of this paper are: physics
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The categories of this paper are: ao-sci
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The categories of this paper are: astro-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: q-bio
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The categories of this paper are: q-alg
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The categories of this paper are: chem-ph
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The categories of this paper are: stat
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-ph