This volume contains the proceedings of the NATO Advanced Research Workshop on "Quantum Chaos - Theory and Experiment", held at the Niels Bohr Institute, University of Copenhagen, in 1991. It brings together leading quantum chaos theorists and experimentalists and aims to improve our understanding of the physics of quantum systems whose classical limit is chaotic. Quantum chaos is a subject of considerable current interest in a variety of fields, in particular nuclear physics, chemistry, statistical mechanics, atomic physics, condensed matter physics and nonlinear dynamics. The volume contains lectures about the currently most active fronts of quantum chaos, such as scars, semiclassical methods, quantum diffusion, random matrix spectra, quantum chaos in atomic and nuclear physics, and possible implications of quantum chaos for the problem of quantum measurement.
The role of perturbation theory in the development of physics; dynamical chaos and many-body quantum systems; unbounded quantum diffusion and a new class of level statistics; quantal suppression of chaos and its realizations; a model for irregular scattering in the presence of localization; localization and delocalization of quantum chaos; scaling properties of localized quantum chaos; dynamical localization - mathematical framework; keeping track of chaos by quantum-nondemolition measurements; tunnelling and the lazy baker's map; regular orbits for the stadium billiard; banded random matrix ensembles; chaotic behaviour of open quantum mechanical systems; relativistic quantum chaos in De Sitter cosmologies; quantum measurement; quantum records; macroscopic quantum objects and their interaction with external environments; continuously measured chaotic quantum systems; measurement aspects of quantum optics; on the completeness of the classical limit of quantum mechanics; looking at the quantum world with classical eyes; quantum mechanics and real events; negative probability and correspondence between quantum and classical physics; when does a wave become a particle?; relativistic model for statevector reduction; quantum measurement and gravity for each other; the dynamical reduction programme.