Abstract
\( \mathcal{N} \) = 2 four dimensional gauge theories admit interesting half BPS surface operators preserving a (2, 2) two dimensional SUSY algebra. Typical examples are (2, 2) 2d sigma models with a flavor symmetry which is coupled to the 4d gauge fields. Interesting features of such 2d sigma models, such as (twisted) chiral rings, and the tt* geometry, can be carried over to the surface operators, and are affected in surprising ways by the coupling to 4d degrees of freedom. We describe in detail a relation between the parameter space of twisted couplings of the surface operator and the Seiberg-Witten geometry of the bulk theory. We discuss a similar result about the tt* geometry of the surface operator. We predict the existence and general features of a wall-crossing formula for BPS particles bound to the surface operator.
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ArXiv ePrint: 0911.1316
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Gaiotto, D. Surface operators in \( \mathcal{N} \) = 2 4d gauge theories. J. High Energ. Phys. 2012, 90 (2012). https://doi.org/10.1007/JHEP11(2012)090
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DOI: https://doi.org/10.1007/JHEP11(2012)090