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 Leonard Susskind, James Lindesay - OECD Publishing
Leonard Susskind, one of the co-inventors of the Holographic Principle as well as one of the founders of String theory, develops and explains these concepts. This well-planned, stimulating and provocative book can be enthusiastically recommended.
by Maximilian Kreuzer - Technische Universitat Wien
Contents: Introduction; The bosonic string; Quantization of bosonic strings; Superstrings; Conformal field theory (conformal group, Wick rotation and Euclidean fields, Tensors, energy-momentum, and correlations, First order systems and ghosts, etc).
by Washington Taylor, Barton Zwiebach - arXiv
Introduction to tachyon condensation in Witten's cubic bosonic open string field theory. We use both the low-energy Yang-Mills description and the language of string field theory to explain the problem of tachyon condensation on unstable D-branes.
by Warren Siegel - arXiv
Several of the early chapters are on the topic of general field theory, but explained from a new point of view resulting from insights gained from string field theory. A standard course on quantum field theory is assumed as a prerequisite.