Octonions, G_2 Symmetry, Generalized Self-Duality and Supersymmetries in Dimensions D \le 8

TL;DR

This paper develops supersymmetric Yang-Mills theories with generalized self-duality in dimensions up to 8, utilizing octonion algebra and symmetry reductions, revealing new structures in lower dimensions.

Contribution

It introduces a novel supersymmetric self-dual vector multiplet in 8D and 7D using octonions, and explores symmetry reductions to G_2 and conjectures similar theories in 6D and 4D.

Findings

Established N=(1/8,1) supersymmetric self-dual theory in 8D.

Derived 7D self-dual supersymmetric theory with G_2 symmetry.

Proposed potential for similar theories in 6D and 4D.

Abstract

We establish N=(1/8,1) supersymmetric Yang-Mills vector multiplet with generalized self-duality in Euclidian eight-dimensions with the original full SO(8) Lorentz covariance reduced to SO(7). The key ingredient is the usage of octonion structure constants made compatible with SO(7) covariance and chirality in 8D. By a simple dimensional reduction together with extra constraints, we derive N=1/8+7/8 supersymmetric self-dual vector multiplet in 7D with the full SO(7) Lorentz covariance reduced to G_2. We find that extra constraints needed on fields and supersymmetry parameter are not obtained from a simple dimensional reduction from 8D. We conjecture that other self-dual supersymmetric theories in lower dimensions D =6 and 4 with respective reduced global Lorentz covariances such as SU(3) \subset SO(6) and SU(2) \subset SO(4) can be obtained in a similar fashion.