Open strings and their symmetry groups

TL;DR

This paper discusses the development of string theory through model-building rules and explores the symmetry groups of open strings, highlighting the approach's role in advancing the field.

Contribution

It introduces a framework for understanding open string symmetry groups based on the model-building approach in string theory.

Findings

Identifies key symmetry groups of open strings.

Highlights the importance of model-building rules in string theory.

Provides insights into the structure of open string models.

Abstract

Much of the recent progress in String Theory can be traced to a precise strategy: a careful study of the few models known since the beginnings of the subject, and the abstraction from them of basic properties that one would like to demand from other models. This could be termed a set of "model-building rules". The approach corresponds to the fact, often a source of embarrassment to specialists, that String Theory, born as a set of rules rather than as a set of principles, has long resisted attempts to reduce it to a logically satisfying structure. Talk presented at the Cargese Summer Institute on Non-Perturbative Methods in Field Theory, Cargese, France, July 16-30, 1987.