An infrared bootstrap of the Schur index with surface defects

Author:

Fluder Martin,Longhi PietroORCID

Abstract

Abstract The infrared formula relates the Schur index of a 4d $$ \mathcal{N} $$ N = 2 theory to its wall-crossing invariant, a.k.a. BPS monodromy. A further extension of this formula, proposed by Córdova, Gaiotto and Shao, includes contributions by various types of line and surface defects. We study BPS monodromies in the presence of vortex surface defects of arbitrary vorticity for general class $$ \mathcal{S} $$ S theories of type A 1 engineered by UV curves with at least one regular puncture. The trace of these defect BPS monodromies is shown to coincide with the action of certain q-difference operators acting on the trace of the (pure) 4d BPS monodromy. We use these operators to develop a “bootstrap” (of traces) of BPS monodromies, relying only on their infrared properties, thereby reproducing the very general ultraviolet characterization of the Schur index.

Publisher

Springer Science and Business Media LLC

Subject

Nuclear and High Energy Physics

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