Classical behavior in quantum systems: the case of straight tracks in a cloud chamber
arXiv:0905.1467 · doi:10.1088/0143-0807/31/1/019
Abstract
The aim of this review is to discuss in a pedagogical way the problem of the emergence of a classical behavior in certain physical systems which, in principle, are correctly described by quantum mechanics. It is stressed that the limit is not sufficient and the crucial role played by the environment must be taken into account. In particular it is recalled the old problem raised by Mott in 1929 (\cite{m}) concerning the straight tracks observed in a cloud chamber, produced by an -particle emitted by a source in the form of a spherical wave. The conceptual relevance of the problem for a clearer understanding of the classical limit is discussed in a historical perspective. Moreover a simple mathematical model is proposed, where the result of Mott is obtained in a rigorous mathematical way.
review paper, 15 pages