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 Keith R. Dienes - arXiv
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.
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 Gleb Arutyunov - Utrecht University
The text covers the basic concepts of modern string theory: covariant and light-cone quantisation of bosonic and fermionic strings, geometry and topology of string world-sheets, vertex operators and string scattering amplitudes, etc.
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.