# CEMPI Scientific Day

## CEMPI Scientific Days March 31st -- April 1st 2022 :

*March 31st afternon session: Amphithéâtre Pierre Glorieux, CERLA :*

14:00-14:50 Satya MAJUMDAR : Nonintersecting Brownian Bridges.

15:00-15:40 Volker MAYER : Géométrie fractale d'ensembles de Julia.

Coffee break.

16h10-16h50 Albert ADIYATULLIN : Unveiling new topological phases with optical fiber networks.

17:00-17h40 Adam RANCON : Small and large deviation of strongly correlated random variables from a renormalization group perspective.

18:00 - 20:00 Evening cocktail.

*April 1st morning session: Amphithéâtre Pierre Glorieux, CERLA :*

Welcome Coffee.

9:00-9:50 E. FRICAIN/M. MAIDA : Présentation générale du bilan 2019-2021.

Coffee break.

10:10-11:20 Stéphane RANDOUX : From wave turbulence to integrable turbulence and soliton gases.

11h20-12h00 Clément CANCES : Modélisation compatible avec la thermodynamique de la corrosion de l'acier.

## CEMPI Scientific Days November 7-8th 2019 :

## CEMPI Scientific Day February 10th 2017 :

*Morning session: Amphithéâtre Pierre Glorieux, CERLA *

09h15. Welcome

09h45-10h30

CEMPI 2015-2016, an overview: Stephan De Bièvre.

CEMPI training program: Pierre Dèbes.

CEMPI economic impact / technology transfer: Marc Douay.

10h30-11h Coffee break.

11h-12h30 Scientific presentations :

- Henrik Ueberschar (CEMPI Postdoc 2014-2016) Delocalisation for Schrödinger operators with random Dirac masses.

- Marc Lefranc (PhLAM) Un modèle mathématique pour comprendre comment le foie se met à l'heure des repas.

- Pierre Suret (PhLAM) Optical rogue waves in integrable turbulence.

12h45-14h45 Lunch (P5 building, room 124).

14h-16h Meeting between CEMPI Advisory board, its Executive and Steering Committees and the ANR (P5 building, room 172).

16h-16h30 Coffee

The CERLA building can be found right next to the Metro Station "Cité Scientifique" (50 meters to your left when leaving the station). The P5 building is attached to the back of the CERLA building.

How to get to the campus of the Université Lille 1 by public transport? The main train stations in Lille are "Lille Europe" and "Lille Flandres". They are very close together and you can walk from one to the other in less than 10 minutes. The direction to "Lille Flandres" is indicated inside "Lille Europe". They each also harbour a subway station. They are linked by subway and only one stop apart.

In "Lille Flandres", there is a direct subway line to the Université Lille 1 (Stop: "Cité Scientifique"", see below for more information)

To get the campus from the subway station "Lille Flandres", take the subway line 1 to "4 Cantons". Get off at "Cité scientifique". You are in the center of the campus.

## CEMPI Scientific Day February 5th 2015 :

Morning session: M1 building, Cauchy Lecture Hall :

09h30. Welcome

09h45-10h45. General presentation of CEMPI (S. De Bievre, M. Douay, P. Debes)

10h45-11h15 Coffee break

11h15-12h45 Scientific progress report

- *Matteo Conforti *(PhLAM). **Modulational instability in dispersion kicked fibers**.

Abstract: We study theoretically and experimentally modulational instability in optical fibers where the dispersion is described by a Dirac delta comb. By means of Floquet theory, we obtain the exact expression for modulational instability gain bands, and we provide simple analytical estimations of the frequency and the bandwidth of the sidebands. We realized different microstructured fibers where the periodic modulation of the dispersion in the propagation direction is a comb of Gaussian pulses having widths much shorter than the period, in order to approximate the ideal Dirac comb. The parametric gain measured under quasi continuous wave excitation is in good agreement with the theory and numerical simulations based on the generalized nonlinear Shroedinger equation.

- *Valery Gritsenko *(Paul Painlevé). **Borchers products: algebra, geometry and strings**.

- *André de Laire* (Paul Painlevé). **Stability in the energy space for chains of solitons for the Landau-Lifshitz equation.**

Abstract: In this talk we will consider the one-dimensional Landau-Lifshitz equation, a model describing the dynamics for the spin in ferromagnetic materials. This equation is related to the Schrodinger maps onto the sphere and also to the cubic nonlinear Schrodinger equation. We prove the orbital stability of sums of solitons with an easy-plane anisotropy, under the assumptions that the speeds of the solitons are different, and that their initial positions are sufficiently separated and ordered according to their speeds.

12h45-14h45 Lunch break

14h45-16h15 Roundtable: CEMPI Advisory board, CEMPI Executive Committee, CEMPI Steering Committee, Representatives of the ANR (M3, room 210, 2nd floor)

16h15-16h45 Coffee (M3, 3rd floor)