String Theory

Contents

• Introduction
• Supersymmetry
• Two-Dimensional Conformal Field Theory
• String Quantization
• The Free String
• String Interactions
• String Field Theory Compactifications
• Orbifolds and Orientifolds
• T-Duality
• T-Duality
• M-theory

Notation

The metric has signature $(+,-,-,-,...)$.

Greek letters from the middle of the alphabet $(\mu ,\nu ,...)$ denote coordinates in spacetime. Roman letters taken from the beginning of the alphabet $(a,b,...)$ denote coordinates on the worldsheet.

The metric is denoted $g_{\mu \nu }$. In the case where there is a metric of spacetime and a metric of the worldsheet, the worldsheet metric is denoted $h_{ab}$

A lower-case $d$ is the number of dimensions. An upper-class $D$ represents the number of spacial dimensions.

The Free String