String Theory


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 StringEdit

The Bosonic String TheoryEdit

The Superstring TheoriesEdit

The Heterotic String TheoriesEdit

String InteractionsEdit

String Field TheoryEdit


Orbifolds and OrientifoldsEdit