In recent years, intensive effort has gone into develo** numerical tools for exact quantum
mechanical calculations that are based on Bohmian mechanics. As part of this effort we …

The ultimate semiclassical wave packet propagation technique is a complex, time-
dependent Wentzel-Kramers-Brillouin method known as generalized Gaussian wave packet …

We present a significant improvement to a complex time-dependent WKB (CWKB)
formulation developed by Boiron and Lombardi [J. Chem. Phys. 108, 3431 (1998)] in which …

During the last decades, semiclassical techniques for single particle systems have been
successfully developed, to the point that they describe the universal and reproducible …

There has been a surprising degree of uncertainty about how, or even whether, the standard
semiclassical theory of Van Vleck and Gutzwiller (VVG) can be used to treat the time …

We present a semiclassical approach to many-body quantum propagation in terms of
coherent sums over quantum amplitudes associated with the solutions of corresponding …

The use of complex-valued trajectories in semiclassical wave packet methods can lead to
problems that prevent calculation of the wave function in certain regions of the configuration …

We discuss some basic tools for an analysis of one-dimensional quantum systems defined
on a cyclic coordinate space. The basic features of the generalized coherent states, the …

Complex-valued classical trajectories in complex time encounter singular times at which the
momentum diverges. A closed time contour around such a singular time may result in final …

Path-integral derivations are presented for two recently developed complex trajectory
techniques for the propagation of wave packets: complex WKB and Bohmian mechanics …