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 Ashoke Sen - arXiv
Basic aspects of non-perturbative string theory are discussed. The topics include test of duality symmetries based on the analysis of the low energy action and the spectrum of BPS states, relationship between different duality symmetries, etc.
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 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 Neil Lambert - King's College London
From the table of contents: Introduction: Why String Theory?; Classical and Quantum Dynamics of Point Particles; Classical and Quantum Dynamics of Strings; Light-cone gauge; Curved Spacetime and an Effective Action; Superstrings.