Interacting singletons

TL;DR

This paper explores the potential physical role of singleton fields as fundamental constituents of massless fields in spacetime, proposing a generalized composite framework that includes various fundamental theories.

Contribution

It introduces a novel approach to describe singleton fields as dipole structures, extending previous composite models to include quantum gravity, supergravity, and QCD.

Findings

Singleton fields can be modeled as dipole structures.

The framework generalizes early composite QED models.

Unitarity of the proposed theories remains conjectural.

Abstract

There is a chance that singleton fields, that in the context of strings and membranes have been regarded as topological gauge fields that can interact only at the boundary of anti-De Sitter space, at spatial infinity, may have a more physical manifestation as costituents of massless fields in space time. The composite character of massless fields is expressed by field - current identities that relate ordinary massless field operators to singleton currents and stress-energy tensors. Naive versions of such identities do not make sense, but when the singletons are described in terms of dipole structures, then such constructions are at least formally possible. The new proposal includes and generalizes an early composite version of QED, and includes quantum gravity, super gravity and models of QCD. Unitarity of such theories is conjectural.