We consider a non-relativistic quantum system consisting of K heavy and N light particles in dimension three, where each heavy particle interacts with the light ones via a two-body potential αV. No interaction is assumed among particles of the same kind. Choosing an initial state in a product form and assuming α sufficiently small we characterize the asymptotic dynamics of the system in the limit of small mass ratio, with an explicit control of the error. In the case K = 1 the result is extended to arbitrary α. The proof relies on a perturbative analysis and exploits a generalized version of the standard dispersive estimates for the Schrödinger group. Exploiting the asymptotic formula, an application to the problem of the decoherence effect produced on a heavy particle by the interaction with the light ones is also outlined.
|Titolo:||On the Asymptotic Dynamics of a Quantum System Composed by Heavy and Light Particles|
|Data di pubblicazione:||2006|
|Digital Object Identifier (DOI):||10.1007/s00220-006-0115-0|
|Appare nelle tipologie:||1.1 Articolo in rivista|
File in questo prodotto: