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String Theory

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The metric has signature .

Greek letters from the middle of the alphabet denote coordinates in spacetime. Roman letters taken from the beginning of the alphabet denote coordinates on the worldsheet.

The metric is denoted . In the case where there is a metric of spacetime and a metric of the worldsheet, the worldsheet metric is denoted

A lower-case is the number of dimensions. An upper-class 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]