### Speaker: **André de Laire**

### University of Lille, France

### Date: Tuesday, January 3, 2023 at 12 Santiago time

**Abstract: **In this talk, we will discuss some properties of traveling waves solutions for some variants of the classical Gross-Pitaevskii equation in the whole space, in order to include new physical models in Bose-Einstein condensates and nonlinear optics.

We are interested in the existence of finite energy localized traveling waves solutions with nonvanishing conditions at infinity, i.e. dark solitons.

After a review of the state of the art in the classical case, we will show some results for a family of Gross-Pitaevskii equations with nonlocal interactions in the potential energy, obtained by variational techniques. Then, we will discuss the existence and behavior of the dark solitons for the Gross-Pitaevskii equation is a strip, according to its width.

This is joint work with Philippe Gravejat, Salvador Lopez-Martinez, and Didier Smets.

**Venue:** Online via Zoom / Sala seminarios DIM, 5th floor, Beauchef 851

**Chair:** Gabrielle Nornberg