What is String Theory?
by Joseph Polchinski
Publisher: arXiv 1994
Number of pages: 154
The first part is an introduction to conformal field theory and string perturbation theory. The second part deals with the search for a deeper answer to the question posed in the title. Contents: Conformal Field Theory; String Theory; Vacua and Dualities; String Field Theory or Not String Field Theory; Matrix Models.
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An introduction to string theory, focusing on the Bosonic string, but treating the superstring as well. A number of appendices on more advanced topics are also provided, including an introduction to orientifolds in various brane configurations.
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This is a pedagogical review article surveying the various approaches towards understanding gauge coupling unification within string theory. The author provides an overview of the different approaches that have been taken in recent years.
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