On Twisted A2n Class-S Theories
Abstract
In this paper, we investigate the twisted A2n sector of class-S theories. Heretofore, the Coulomb branches of such theories have been poorly understood. In this, and a companion paper, we make progress in our understanding of them. In particular, we find a formula for the dimension of the Coulomb branch of any twisted A2n class-S theory. Deferring a systematic analysis to the companion paper, we here determine many contributions of punctures to the graded Coulomb branch dimensions, and in some low rank cases, all of them. We are then able to identify a variety of known 4d N=2 SCFTs with twisted A2n theories, and reproduce many of their known properties, such as S-duality amongst certain Argyres-Douglas theories.
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