Macroscopic quantum dynamics of ultra cold Bose gases

Speaker: Prof. Piotr Deuar
Affiliation: Institute of Physics, Polish Academy of Sciences, Warsaw, Poland

In the field of ultracold quantum systems, the celebrated nonlinear Schrodinger equation (aka the Gross-Pitaevskii equation)
is in ubiquitous use to model the system and its quantum dynamics. However, what to do if this or its perturbative expansion,
Bogoliubov theory, does not suffice?  I will present some of the relevant physics in the field such as thermal spontaneous
soliton formation, quantum turbulence and superfluid defects, and give examples of how they can be simulated. In particular
using the scalable “classical field” approaches. These allow one to deal with nonperturbative and far out of equilibrium
physics, but can be subject to an ultraviolet catastrophe, and the resulting dependence on a technical parameter – the cutoff.
We have recently developed a modified classical field approach that no longer suffers from these problems, and I will present
some of his work and its background. 

Link to MS Teams meeting

Seminar language: English

Chaiman: Ireneusz Weymann

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