Speaker
Description
The sudden removal of trapping potentials in Bose-Einstein condensates (BECs) gives rise to superfluid versions of hydrodynamic $\textit{dam-breaking}$ problems, leading to rich quantum dispersive-wave dynamics. Denoting $\Delta n/n_{0}$ as the initial difference in density between the two reservoirs on either side of the dam relative to the lower reservoir density $n_{0}$, we numerically and analytically study the Gross-Pitaevskii equation to model both perturbative $\Delta n << n_{0}$ and non-perturbative $\Delta n\sim n_{0}$ quantum dam-breaking scenarios. We compare and contrast the different regimes by making connections to the mathematics of tidal bores, and reveal an underlying wave structure that mimics the physics of double rainbows. In the non-perturbative regime dam-breaking can be accompanied by the formation of dynamical sonic event horizons within rarefaction waves. We comment on the horizon dynamics and the possibility of detecting sonic Hawking radiation from such horizons.
| Keyword-1 | Bose-Einstein Condensate |
|---|---|
| Keyword-2 | Dynamics |
| Keyword-3 | Analogue gravity |