Strongly coupled phases of $\mathcal{N}=1$ S-duality

Abstract

We analyze S-duality of orientifolds of the Calabi-Yau cone over the first del Pezzo surface ($d{P}_1$). The S-duals of known phases, described by quiver gauge theories, contain intrinsically strongly-coupled sectors. These sectors are realized by a higher multiplicity intersection of NS5 branes and D5 branes atop an O5 plane, and can be thought of as stuck at the infinite coupling point between two Seiberg-dual gauge theories. We argue that such sectors appear generically in orientifolds of non-orbifold singularities, where in many examples every orientifold phase contains such a sector. Understanding such sectors is therefore key to understanding orientifolds of Calabi-Yau singularities. We construct the strongly-coupled sectors for $d{P}_1$ orientifolds using deconfinement, and show that they have interesting, non-trivial properties. Using this construction, we verify the predictions of S-duality for $d{P}_1$.

arXiv comment66 pages, 34 figures

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Cited by in corpus (1)

• Orientifolds of Warped Throats from Toric Calabi-Yau Singularities