QED as the tensionless limit of the spinning string with contact interaction

TL;DR

This paper proposes a novel string-theoretic model where QED with spinor matter emerges as the tensionless limit of spinning strings with contact interactions, connecting string theory and quantum electrodynamics.

Contribution

It introduces a tensionless spinning string framework with contact interactions that reproduces QED with spinor matter via the super-Wilson loop in the world-line formalism.

Findings

QED can be derived from tensionless spinning strings with contact interactions.

The model maintains world-sheet and world-line supersymmetry.

The super-Wilson loop couples spinor matter to electromagnetism.

Abstract

We outline how QED with spinor matter can be described by the tensionless limit of spinning strings with contact interactions. The strings represent electric lines of force with charges at their ends. The contact interaction is constructed from a delta-function on the world-sheet which, although off-shell, decouples from the world-sheet metric. Integrating out the string degrees of freedom with fixed boundary generates the super-Wilson loop that couples spinor matter to electromagnetism in the world-line formalism. World-sheet and world-line, but not spacetime, supersymmetry underpin the model.