Stuttgart 2012 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 34: Poster 1

Q 34.39: Poster

Dienstag, 13. März 2012, 16:30–19:00, Poster.I+II

Calaculation of the boune trajectory and macroscopic quantum tunneling rates of BEC with attractive 1/r-interaction — •Pascal Wieland, Kai Marquardt, Jörg Main, and Günter Wunner — 1. Institut für Theoretische Physik, Universität Stuttgart

Monopolar Bose-Einstein condensates with attractive 1/r-interaction, described by the Gross-Pitaevskii equation can decay due to macroscopic quantum tunneling. The tunneling rate depends on the Euclidean action of the bounce trajectory. To calculate the trajectory we use a time-dependent variational principle with an multi-gaussian ansatz. In addition numerical exact simulations are performed on space-time lattices, using a Split-Operator methode. The results for both approaches are compared.