Pauli-Lubanski limit and stress-energy tensor for infinite-spin fields

TL;DR

This paper constructs string-localized quantum fields for infinite-spin representations as limits of finite-mass, finite-spin fields, and introduces a novel stress-energy tensor without classical Lagrangian dependence.

Contribution

It provides a new construction of infinite-spin quantum fields and a unique stress-energy tensor formulation independent of classical Lagrangian frameworks.

Findings

Fields are constructed as limits of finite-mass, finite-spin fields.

A new prescription for the stress-energy tensor is introduced.

The approach does not rely on classical Lagrangian formulations.

Abstract

String-localized quantum fields transforming in Wigner's infinite-spin representations were introduced by Mund, Schroer and Yngvason. We construct these fields as limits of fields of finite mass $m\to 0$ and finite spin $s\to\infty$. We determine a string-localized infinite-spin quantum stress-energy tensor with a novel prescription that does not refer to a classical Lagrangean.