Introduction to String Theory
by Gerard 't Hooft
Publisher: Utrecht University 2004
Number of pages: 79
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, the GSO projection, zero modes, etc.
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by Sunil Mukhi - arXiv
This text provides some historical background and then reviews developments in string theory over the last twenty-five years. Both perturbative and non-perturbative approaches are surveyed and their impact on how we view quantum gravity is analysed.
by Joseph Polchinski - arXiv
This is an introduction to conformal field theory and string perturbation theory. The authors search for a deeper answer to the question posed in the title. Contents: Conformal Field Theory; String Theory; Vacua and Dualities; and more.
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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.