Abstract
During the last years many efforts have been made to study quantum field theory in given unquantized space-times. This external field approach for the influence of classical gravitational fields is generally regarded as some sort of semi-classical approximation to a full quantum theory of gravity. It is assumed that characteristic physical traits which show up in this approximation will be at least heuristically important for the construction of the full theory. Furthermore the approximation has its own domain of application during the very early stages of the universe and outside black holes.KeywordsBlack HoleMassive ParticleMutual InteractionMassless ParticleParticle CreationThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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