String Theory and M-Theory

Paperback. Pub Date: 2011 Pages: 739 in Publisher: World Publishing Company String theory is one of the most in my field adequately and challenging areas of modern theoretical physics It was developed in the late 1960s for the purpose of de-scribing the strong nuclear force. Problems were encountered that prevented this program from attaining complete success. In particular. it was realized that the dpectrum of a fundamental string contains an undesired massless spin-two particle. Quantum chromodynamics eventually proved to be the correct theory for describing the strong force and the properties of hadrons. New doors opened for string theory when in 1974 it was proposed to identify the massless spin-two particle in the strings spectrum with the graviton. the quantum of gravitation. String theory became then the most promising can-didate for a quantum theory of gravity unifie...