Orateur
Prof.
Arnaldo Gammal
(Universidade de Sao Paulo)
Description
We investigate by numerical simulations the pattern formation after an oscillating attractive-repulsive obstacle inserted into the flow of a Bose-Einstein condensate. For slow oscillations we observe a complex emission of vortex dipoles. For moderate oscillations organized lined up vortex dipoles are emitted. For high frequencies no dipoles are observed but only lined up dark fragments. The results show that the drag force turns negative for sufficiently high frequency. We also successfully model the ship waves in front of the obstacle. In the limit of very fast oscillations all the excitations of the system tend to vanish.
Auteur principal
Prof.
Arnaldo Gammal
(Universidade de Sao Paulo)
Co-auteur
Dr
Eduardo Georges Khamis
(Universidade de Sao Paulo)
