A Comment on Continuous Spin Representations of the Poincar\'e Group and Perturbative String Theory

TL;DR

This paper demonstrates that continuous spin representations of the Poincaré group do not appear in perturbative string theory, highlighting a fundamental low-energy limitation of these models.

Contribution

It provides a model-independent argument showing the absence of massless continuous spin representations in perturbative string theory.

Findings

Continuous spin representations are absent in perturbative string theory.

This absence is a fundamental low-energy consequence of string models.

Abstract

We make a simple observation that the massless continuous spin representations of the Poincar\'e group are not present in perturbative string theory constructions. This represents one of the very few model-independent low-energy consequences of these models.