What is "system" : the arguments from the decoherence theory
Abstract
Within the decoherence theory we investigate the physical background of the condition of the separability (diagonalizability in noncorrelated basis) of the interaction Hamiltonian of the composite system, "system plus environment". It proves that the condition of the separability may serve as a criterion for defining "system", but so that "system" cannot be defined unless it is simultaneously defined with its "environment". When extended to a set of the mutually interacting composite systems, this result implies that the separability conditions of the local interactions are mutually tied. The task of defining "system" (and "environment") via investigating the separability of the Hamiltonian is a sort of the inverse task of the decoherence theory. A simple example of doing the task is given.
 Publication:

arXiv eprints
 Pub Date:
 March 1999
 arXiv:
 arXiv:quantph/9903037
 Bibcode:
 1999quant.ph..3037D
 Keywords:

 Quantum Physics
 EPrint:
 18 (double spaced) pages, no figures