Hamburg 2009 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 15: Poster I

A 15.30: Poster

Dienstag, 3. März 2009, 16:30–19:00, VMP 9 Poster

Towards a Gross-Pitaevskii-Boltzmann Equation — •Luis Rico Perez and James Anglin — Technische Universität Kaiserslautern

Despite many progresses in the theoretical description of cold atoms have been achieved, the search of a general but at the same time simple formalism explaining nonequilibrium phenomena in cold bosons - as the condensation process, heating or collisions between two of them - is still an interesting problem. We develop a simple description of cold interacting bosons based on the single particle density matrix rather than the macroscopic wave function, which is therefore able to include thermodynamic properties of the gas on an equal footing with Gross-Pitaveskii mean field dynamics. Our theory includes incoherent scattering as well as Gross-Pitaevskii coherent interaction, by adapting Boltzmann’s classical Stosszahlansatz to time-dependent s-wave scattering of wave packets.