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Type: Artigo de periódico
Title: Semiclassical propagation of wavepackets with complex and real trajectories
Author: de Aguiar, MAM
Baranger, M
Jaubert, L
Parisio, F
Ribeiro, AD
Abstract: We consider a semiclassical approximation, first derived by Heller and coworkers, for the time evolution of an originally Gaussian wave packet in terms of complex trajectories. We also derive additional approximations replacing the complex trajectories by real ones. These yield three different semiclassical formulae involving different real trajectories. One of these formulae is Heller's thawed Gaussian approximation. The other approximations are non-Gaussian and may involve several trajectories determined by mixed initial-final conditions. These different formulae are tested for the cases of scattering by a hard wall, scattering by an attractive Gaussian potential and bound motion in a quartic oscillator. The formula with complex trajectories gives good results in all cases. The non-Gaussian approximations with real trajectories work well in some cases, whereas the thawed Gaussian works only in very simple situations.
Country: Inglaterra
Editor: Iop Publishing Ltd
Citation: Journal Of Physics A-mathematical And General. Iop Publishing Ltd, v. 38, n. 21, n. 4645, n. 4664, 2005.
Rights: fechado
Date Issue: 2005
Appears in Collections:Unicamp - Artigos e Outros Documentos

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