String Theory

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Introduction Supersymmetry Two-Dimensional Conformal Field Theory String Quantization The Free String String Interactions String Field Theory Compactification Orbifolds and Orientifolds T-Duality D-branes M-Theory


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_{a b}

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

The Free String[edit]

The Bosonic String Theory[edit]

The Super string theory[edit]

The Heterotic String Theories[edit]

String Interactions[edit]

String Field Theory[edit]


Orbifolds and Orientifolds[edit]