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A unified theory embracing all physical phenomena is a major goal
of theoretical physics. In the early 1980s, many physicists looked
to eleven-dimensional supergravity in the hope that it might
provide that elusive superunified theory. In 1984 supergravity was
knocked off its pedestal by ten-dimensional superstrings,
one-dimensional objects whose vibrational modes represent the
elementary particles. Superstrings provided a perturbative finite
theory of gravity which, after compactification to four spacetime
dimensions, seemed in principle capable of explaining the Standard
Model. Despite these major successes, however, nagging doubts
persisted about superstrings. Then in 1987 and 1992 the elementary
supermembrane and its dual partner, the solitonic superfivebrane,
were discovered. These are supersymmetric extended objects with
respectively two and five dimensions moving in an
eleven-dimensional spacetime.
This book was first published in 1982. It consists of selected contributions presented at the Nuffield Quantum Gravity Workshop held at Imperial College, London, in August 1981. The book is divided into three parts which correspond with the three separate themes pursued at the workshop. Part I is concerned with the geometrical and topological aspects of quantum gravity. Part II focuses on supergravity and its application to the Grand Unified Theories of elementary particles. Part III concentrates on the early universe and cosmology. The book, therefore, covers not only supergravity, but the whole spectrum of quantum gravity research.
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