title: Generalized Gaussian wave packet dynamics: Integrable and chaotic systems.
abstract: The ultimate semiclassical wave packet propagation technique is a complex, time-dependent Wentzel-Kramers-Brillouin method known as generalized Gaussian wave packet dynamics (GGWPD). It requires overcoming many technical difficulties in order to be carried out fully in practice. In its place roughly twenty years ago, linearized wave packet dynamics was generalized to methods that include sets of off-center, real trajectories for both classically integrable and chaotic dynamical systems that completely capture the dynamical transport. The connections between those methods and GGWPD are developed in a way that enables a far more practical implementation of GGWPD. The generally complex saddle-point trajectories at its foundation are found using a multidimensional Newton-Raphson root search method that begins with the set of off-center, real trajectories. This is possible because there is a one-to-one correspondence. The neighboring trajectories associated with each off-center, real trajectory form a path that crosses a unique saddle; there are exceptions that are straightforward to identify. The method is applied to the kicked rotor to demonstrate the accuracy improvement as a function of ℏ that comes with using the saddle-point trajectories.
authors: Department of Physics and Astronomy, Washington State University, Pullman, Washington 99164-2814, USA and Instituto de Ciencias Físicas, Universidad Nacional Autónoma de México - C.P. 62210 Cuernavaca, México.
authors: Harinder
authors: H
authors: Pal
authors: Department of Physics and Astronomy, Washington State University, Pullman, Washington 99164-2814, USA and Instituto de Ciencias Físicas, Universidad Nacional Autónoma de México - C.P. 62210 Cuernavaca, México.
authors: Manan
authors: M
authors: Vyas
authors: Department of Physics and Astronomy, Washington State University, Pullman, Washington 99164-2814, USA and Max-Planck-Institut für Physik komplexer Systeme, Nöthnitzer Straße 38, D-01187 Dresden, Germany.
authors: Steven
authors: S
authors: Tomsovic