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.
A short introduction to superstring theory. From the table of contents: Classical Theory of String; Quantization; Supersymmetry and Superstring; Compactification; Types of Superstring Theory; M-theory; Problems and Future Development.
by E. Kiritsis - arXiv
An introduction to superstring theory: classical strings, covariant and light-cone quantization, supersymmetric strings, anomaly cancelation, compactification, T-duality, supersymmetry breaking, and threshold corrections to low-energy couplings.
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.