2022/04/21 by Guarino, Adolfo, Sterckx, Colin · 1 citation
#FOS: Physical sciences #High Energy Physics - Theory (hep-th)
paper · doi:10.48550/arxiv.2204.09993
We review recent progress in the study of S-folds in light of the gauge/gravity duality and the AdS swampland conjecture. S-folds correspond to non-geometric backgrounds of type IIB supergravity of the form \textrmAdS4 × \textrmS1 × M that involve a non-trivial \textrmSL(2, ℤ) (S-duality) monodromy for the type IIB fields when moving around the \textrmS1. We present four such solutions with M=\textrmS5 that preserve N=4,2,1,0 supersymmetries. Via the AdS/CFT correspondence, these solutions are conjectured to describe new strongly coupled three-dimensional CFT's on a localised interface of SYM. We discuss the existence of flat deformations in the gravity side dual to marginal deformations of the conjectured S-fold CFT's. From a geometrical perspective, the flat deformations induce a monodromy h on M and replace \textrmS1 × M by the so-called mapping torus T(M)h. Interestingly, the flat deformations provide a controlled mechanism of supersymmetry breaking for N ≥ 2 S-folds. We present a class of such non-supersymmetric S-folds obtained by flat-deforming the N=4 S-fold and discuss their (non-)perturbative stability.