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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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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