Do all 5d SCFTs descend from 6d SCFTs?

Lakshya Bhardwaj

doi:10.1007/jhep04(2021)085

Abstract

We present examples of 5d SCFTs that serve as counter-examples to a recently actively studied conjecture according to which it should be possible to obtain all 5d SCFTs by integrating out BPS particles from 6d SCFTs compactified on a circle. We further observe that it is possible to obtain these 5d SCFTs from 6d SCFTs if one allows integrating out BPS strings as well. Based on this observation, we propose a revised version of the conjecture according to which it should be possible to obtain all 5d SCFTs by integrating out both BPS particles and BPS strings from 6d SCFTs compactified on a circle. We describe a general procedure to integrate out BPS strings from a 5d theory once a geometric description of the 5d theory is given. We also discuss the consequences of the revised conjecture for the classification program of 5d SCFTs.

Highlights

E7 with 1 ≤ n ≤ 6 half-hypers in “fundamental” representation, that is, the irreducible representation of dimension 56
We present examples of 5d SCFTs that serve as counter-examples to a recently actively studied conjecture according to which it should be possible to obtain all 5d SCFTs by integrating out BPS particles from 6d SCFTs compactified on a circle
We propose a revised version of the conjecture according to which it should be possible to obtain all 5d SCFTs by integrating out both BPS particles and BPS strings from 6d SCFTs compactified on a circle

Summary

Introduction

E7 with 1 ≤ n ≤ 6 half-hypers in “fundamental” representation, that is, the irreducible representation of dimension 56. Such RG flows correspond to decompactifying compact 4-cycles in the Calabi-Yau threefold used in the corresponding M-theory construction. This would require studying all the possible decompactifications of a single 4-cycle in the Calabi-Yau threefolds associated to 5d KK theories upto rank four.

Results

Conclusion