Abstract
We study BPS line defects in \( \mathcal{N} \) = 2 supersymmetric four-dimensional field theories. We focus on theories of “quiver type,” those for which the BPS particle spectrum can be computed using quiver quantum mechanics. For a wide class of models, the renormalization group flow between defects defined in the ultraviolet and in the infrared is bijective. Using this fact, we propose a way to compute the BPS Hilbert space of a defect defined in the ultraviolet, using only infrared data. In some cases our proposal reduces to studying representations of a “framed” quiver, with one extra node representing the defect. In general, though, it is different. As applications, we derive a formula for the discontinuities in the defect renormalization group map under variations of moduli, and show that the operator product algebra of line defects contains distinguished subalgebras with universal multiplication rules. We illustrate our results in several explicit examples.
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Córdova, C., Neitzke, A. Line defects, tropicalization, and multi-centered quiver quantum mechanics. J. High Energ. Phys. 2014, 99 (2014). https://doi.org/10.1007/JHEP09(2014)099
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DOI: https://doi.org/10.1007/JHEP09(2014)099