From Superstrings to M Theory

TL;DR

This paper reviews the development of M theory, an 11-dimensional quantum framework emerging from strong coupling limits of type IIA superstring theory, with evidence and implications discussed.

Contribution

It summarizes the evidence for M theory as a unifying 11d quantum theory extending superstring concepts.

Findings

Type IIA develops an extra dimension at strong coupling

M theory approximates 11d supergravity at low energies

Evidence supports M theory as a consistent 11d quantum framework

Abstract

In the strong coupling limit type IIA superstring theory develops an eleventh dimension that is not apparent in perturbation theory. This suggests the existence of a consistent 11d quantum theory, called M theory, which is approximated by 11d supergravity at low energies. In this review we describe some of the evidence for this picture and some of its implications.