László B. Szabados Quasi-Local Energy-Momentum and Angular Momentum in General Relativity The present status of the quasi-local mass, energy-momentum and angular-momentum constructions in general relativity is reviewed. First, the general ideas, concepts, and strategies, as well as the necessary tools to construct and analyze the quasi-local quantities, are recalled. Then, the various specific constructions and their properties (both successes and deficiencies are discussed. Finally, some of the (actual and potential) applications of the quasi-local concepts and specific constructions are briefly mentioned. 2009-03-24 2009-06-19 2012-12-07 Quasi-local angular momentum Quasi-local energy-momentum Quasi-local mass General relativity Witten equations lrr-2009-4 Max Planck Institute for Gravitational Physics