Göttingen 2025 – scientific programme

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MP: Fachverband Theoretische und Mathematische Grundlagen der Physik

MP 4: Dynamics and Chaotic Behaviour

MP 4.1: Invited Talk

Wednesday, April 2, 2025, 11:00–11:30, ZHG001

Focusing dynamics for 2d Bose gases in the instability regime — •Lea Boßmann — FAU Erlangen-Nürnberg

We consider the dynamics of a 2d Bose gas with singular attractive interactions in the instability regime, where the corresponding focusing nonlinear Schrödinger equation (NLS) has a blow-up. We show that the evolution of the condensate is effectively described by this NLS for all times before the blow-up. Moreover, we prove the validity of the Bogoliubov approximation for the fluctuation dynamics, resulting in a norm approximation of the many-body dynamics. This is joint work with Charlotte Dietze and Phan Thành Nam.

Keywords: Bose-Einstein condensate; quantum many-bosy systems; effective evolution equations; mathematical physics