%0 Journal Article
%T The Isaacson expansion in quantum cosmology
%A Carsten Gundlach
%J Physics
%D 1993
%I arXiv
%R 10.1103/PhysRevD.48.1700
%X This paper is an application of the ideas of the Born-Oppenheimer (or slow/fast) approximation in molecular physics and of the Isaacson (or short-wave) approximation in classical gravity to the canonical quantization of a perturbed minisuperspace model of the kind examined by Halliwell and Hawking. Its aim is the clarification of the role of the semiclassical approximation and the backreaction in such a model. Approximate solutions of the quantum model are constructed which are not semiclassical, and semiclassical solutions in which the quantum perturbations are highly excited.
%U http://arxiv.org/abs/gr-qc/9303016v2