II. Non adiabatic theory of collisions in a radiative field. Semi-classical limit : Ar + O case

Non adiabatic theory of collisions in a radiative field. Semi-classical limit

Soliton-like Solutions of the Complex Non-linear Klein-Gordon Systems in 1 + 1 Dimensions

In this paper, we present soliton-like solutions of the non-linear complex Klein-Gordon systems in 1+1 dimensions. We will use polar representation to introduce three different soliton-like solutions including, complex kinks (anti-kinks), radiative profiles, and localized wave-packets. Complex kinks (anti-kinks) are topological objects with zero electrical charges. Radiative profiles are object...

Non-adiabatic losses from radio-frequency dressed cold atom traps: beyond the Landau-Zener model

Non-adiabatic decay rates for a radio-frequency dressed magnetic trap are calculated using Fermi’s Golden Rule: that is, we examine the probability for a single atom to make transitions out of the dressed trap and into a continuum in the adiabatic limit, where perturbation theory can be applied. This approach can be compared to the semi-classical Landau-Zener theory of a resonant dressed atom t...

Quantum Adiabatic Approximation, Quantum Action, and Berry’s Phase

An alternative interpretation of the quantum adiabatic approximation is presented. This interpretation is based on the ideas originally advocated by David Bohm in his quest for establishing a hidden variable alternative to quantum mechanics. It indicates that the validity of the quantum adiabatic approximation is a sufficient condition for the separability of the quantum action function in the ...

ar X iv : a st ro - p h / 98 08 17 4 v 1 1 7 A ug 1 99 8 Magnetohydrodynamics of Cloud Collisions in a Multi - phase Interstellar Medium 4

We extend previous studies of the physics of interstellar cloud collisions by beginning investigation of the role of magnetic fields through 2D magnetohydrodynamical (MHD) numerical simulations. In particular, we study head-on collisions between equal mass, mildly supersonic diffuse clouds similar to our previous study. Here we include a moderate magnetic field, corresponding to β = pg/pb = 4, ...