# Supersymmetric Indices of 3d S-fold SCFTs

## TL;DR

This paper studies three-dimensional S-fold superconformal field theories, computing their supersymmetric indices to reveal symmetry enhancements and dualities, and introduces new theories with unique global structures.

## Contribution

It provides the first detailed analysis of supersymmetric indices in S-fold SCFTs, uncovering symmetry enhancement and dualities, and introduces a novel class of theories with distinct global structures.

## Key findings

- Indices show supersymmetry enhancement at infrared fixed points
- Dualities between different quiver descriptions are identified
- New theories with discrete global symmetries are proposed

## Abstract

Enhancement of global symmetry and supersymmetry in the infrared is one of the most intriguing phenomena in quantum field theory. We investigate such phenomena in a large class of three dimensional superconformal field theories, known as the S-fold SCFTs. Supersymmetric indices are computed for a number of theories containing small rank gauge groups. It is found that indices of several models exhibit enhancement of supersymmetry at the superconformal fixed point in the infrared. Dualities between S-fold theories that have different quiver descriptions are also analysed. We explore a new class of theories with a discrete global symmetry, whose gauge symmetry in the quiver has a different global structure from those that have been studied earlier.