Reformulating String Theory with the $1/N$ Expansion

TL;DR

This paper proposes a new formulation of string theory where strings are viewed as composite systems of point-like objects, using 't Hooft's $1/N$ expansion to clarify stability and causality.

Contribution

It introduces a reinterpretation of string theory based on the $1/N$ expansion, emphasizing a composite view of strings over fundamental objects.

Findings

String theory can be reformulated with explicit stability and causality.

Strings are modeled as composite systems of point-like constituents.

The approach aligns with 't Hooft's $1/N$ expansion and light-cone parametrization.

Abstract

We argue that string theory should have a formulation for which stability and causality are evident. Rather than regard strings as fundamental objects, we suggest they should be regarded as composite systems of more fundamental point-like objects. A tentative scheme for such a reinterpretation is described along the lines of 't Hooft's $1/N$ expansion and the light-cone parametrization of the string.