We review the formulation of time correlation functions for a quantum system at thermal equilibrium within the Wigner formalism of quantum mechanics. We derive their semiclassical limit and sketch a simple algorithm for their computation. We apply such a scheme to study the spectrum of density fluctuations of He-4 in the quantum region although far from the superfluid. Preliminary results compare encouraging well with recent infrared X-ray scattering data. (C) 1999 Elsevier Science B.V. All rights reserved.
Wigner approach to the semiclassical dynamics of a quantum many-body system: the dynamic scattering function of He-4 / Ciccotti, Giovanni; C., Pierleoni; F., Capuani; V. S., Filinov. - In: COMPUTER PHYSICS COMMUNICATIONS. - ISSN 0010-4655. - 121:(1999), pp. 452-459. (Intervento presentato al convegno Europhysics Conference on Computational Physics (CCP 98) tenutosi a GRANADA, SPAIN nel SEP 02-05, 1998) [10.1016/s0010-4655(99)00381-1].
Wigner approach to the semiclassical dynamics of a quantum many-body system: the dynamic scattering function of He-4
CICCOTTI, Giovanni;
1999
Abstract
We review the formulation of time correlation functions for a quantum system at thermal equilibrium within the Wigner formalism of quantum mechanics. We derive their semiclassical limit and sketch a simple algorithm for their computation. We apply such a scheme to study the spectrum of density fluctuations of He-4 in the quantum region although far from the superfluid. Preliminary results compare encouraging well with recent infrared X-ray scattering data. (C) 1999 Elsevier Science B.V. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
