Conformal S-dualities from O-planes

TL;DR

This paper explores how orientifold projections on necklace quivers with fractional branes produce 4d SCFTs with inherited S-duality, revealing new dualities among models with different gauge groups but identical central charges and indices.

Contribution

It introduces a novel class of 4d SCFTs obtained via orientifold projections, demonstrating inherited S-duality driven by adjoint fields with R-charge one.

Findings

Models with different gauge groups can share the same central charges.

Superconformal indices are preserved under certain orientifold projections.

Presence of adjoint fields with R-charge one underpins inherited S-duality.

Abstract

We study 4d SCFTs obtained by orientifold projections on necklace quivers with fractional branes. The models obtained by this procedure are $\mathcal{N}=1$ linear quivers with unitary, symplectic and orthogonal gauge groups, bifundamental and tensorial matter. Remarkably, models that are not dual in the unoriented case can have the same central charges and superconformal index after the projection. The reason for this behavior rests upon the ubiquitous presence of adjoint fields with R-charge one. We claim that the presence of such fields is at the origin of the notion of inherited S-duality on the models' conformal manifold.