Semiclassical framed BPS states

Abstract

We provide a semiclassical description of framed BPS states in four-dimensional N = 2 super Yang-Mills theories probed by 't Hooft defects, in terms of a supersymmetric quantum mechanics on the moduli space of singular monopoles. Framed BPS states, like their ordinary counterparts in the theory without defects, are associated with the L^2 kernel of certain Dirac operators on moduli space, or equivalently with the L^2 cohomology of related Dolbeault operators. The Dirac/Dolbeault operators depend on two Cartan-valued Higgs vevs. We conjecture a map between these vevs and the Seiberg-Witten special coordinates, consistent with a one-loop analysis and checked in examples. The map incorporates all perturbative and nonperturbative corrections that are relevant for the semiclassical construction of BPS states, over a suitably defined weak coupling regime of the Coulomb branch. We use this map to translate wall crossing formulae and the no-exotics theorem to statements about the Dirac/Dolbeault operators. The no-exotics theorem, concerning the absence of nontrivial SU(2)_R representations in the BPS spectrum, implies that the kernel of the Dirac operator is chiral, and further translates into a statement that all L^2 cohomology of the Dolbeault operator is concentrated in the middle degree. Wall crossing formulae lead to detailed predictions for where the Dirac operators fail to be Fredholm and how their kernels jump. We explore these predictions in nontrivial examples. This paper explains the background and arguments behind the results announced in a short accompanying note.

v1: 161+78 pages, 5 figures; v2: typos corrected

References in corpus (14)

• Stability structures, motivic Donaldson-Thomas invariants and cluster transformations
• Magnetic Monopole Dynamics, Supersymmetry, and Duality
• HyperKahler and quaternionic Kahler manifolds with S^1-symmetries
• Instantons on Gravitons
• The Coulomb Branch of 3d $\mathcal{N}=4$ Theories
• Moduli Spaces of Instantons on the Taub-NUT Space
• Framed BPS States, Moduli Dynamics, and Wall-Crossing
• The 't Hooft-Polyakov Monopole in the Presence of a 't Hooft Operator
• Geometric engineering of (framed) BPS states
• Singular Monopoles via the Nahm Transform
• Wilson-'t Hooft operators and the theta angle
• Scalar Soliton Quantization with Generic Moduli
• L^2-Kernels Of Dirac-Type Operators On Monopole Moduli Spaces
• About the Absence of Exotics and the Coulomb Branch Formula

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