Contents

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Notation

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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

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The Bosonic String Theory

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The Super string theory

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The Heterotic String Theories

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String Interactions

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String Field Theory

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Compactification

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Orbifolds and Orientifolds

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T-Duality

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D-branes

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M-Theory

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