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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by Gerard 't Hooft - Utrecht University
Contents: strings in QCD, the classical string, open and closed strings, quantization, Lorentz invariance, interactions and vertex operators, BRST quantization, the Polyakov path integral, T-Duality, complex coordinates, fermions in strings, etc.
by Thomas Mohaupt - arXiv
These notes give an introduction to string theory for students and interested researches. No previous knowledge of string theory is assumed. The focus is on gravitational aspects and we explain how gravity is described in string theory.
by Andrew Neitzke, Cumrun Vafa - arXiv
We give an introductory review of topological strings and their application to various aspects of superstrings and supersymmetric gauge theories. This review includes developing the necessary mathematical background for topological strings.
by Matthew Headrick - arXiv
The author present detailed solutions to 81 of the 202 problems in J. Polchinski's two-volume textbook 'String Theory', the most comprehensive text addressing the discoveries of the superstring revolutions of the early to mid 1990's.