2002/11/20 by B. Vacchini
Physics and Astronomy · #quant-ph
published as The foundations of quantum mechanics - historical analysis and open questions, C. Garola and A. Rossi eds., p. 407-418, World Scientific, Singapore 2000 · 12 pages, no figures, contribution to the Proceedings of the Conference on The foundations of quantum mechanics - historical analysis and open questions, 1998 (Lecce, Italy)
arxiv created 2002/11/20 · arxiv updated 2009/12/01
It is argued that in the description of macroscopic systems inside quantum mechanics the study of the dynamics of selected degrees of freedom slowly varying on a suitable time scale, corresponding to relevant observables for the given reduced description, is particularly meaningful. A formalism developing these ideas in the more simple case of a microsystem interacting with a macroscopic system is briefly outlined, together with an application to the field of neutron optics. The obtained reduced description relies on a T-matrix formalism and has the property of complete positivity.