- New numerical schemes for extreme geophysical phenomenaSep 29, 2016 to Sep 30, 2016
## Final GeoNum Workshop

### New numerical schemes for extreme geophysical phenomena

The GeoNum project aims at deriving high-order numerical methods to approximate nonlinear hyperbolic systems that arise when considering gravitational flows. The objectives are twofold. On the one hand, relevant models have to be carefully chosen in order to perform simulations of physical interest. Indeed, geophysical flows are generally modelled using Saint-Venant equations, which are not systematically well adapted to predict sophisticated shallow water flows. These models have to be extended to take into account important phenomena including turbulence, complex bathymetries or the sediments' impact on the topography's variation. On the other hand, the developments of new strategies to enforce highly accurate approximations required to simulate environmental flows are considered. Moreover, a particular attention must be paid on the robustness of the suggested algorithms. To address such an issue, classical schemes have to be extended into relevant high order approximations independently of both chosen topography and domain geometry. As a consequence, the resulting approaches are well adapted to perform real-life simulations.

### Lieu: Laboratoire de Mathématiques Jean Leray

- Journée d'information et de réflexion sur l'édition scientifiqueSep 29, 2016
**Cette journée a pour objectif d'informer les mathématicien-ne-s rennais-es sur le paysage de l'édition scientifique mathématique actuel et ses évolutions en cours. Elle ambitionne également de stimuler des comportements vertueux des individus et des structures en matière de publication d'articles et d'utilisation des ressources documentaires.**### Programme

09:30-10:30 Frédéric Hélein,

*Le paysage actuel de l'édition scientifique*

10:30-11:30 Thierry Bouche,*Présentation du Cedram et autres nouvelles initiatives*

11:30-12:30 Laurent Guillopé,*La SMF comme maison d'édition*

12:30-14:00 Déjeuner

14:00-15:00 Reinie Erné et Bas Edixhoven,*La Fondation Compositio Mathematica*

15:00-16:00 Claude Sabbah,*Un exemple de journal électronique, le Journal de l'Ecole Polytechnique*### Organisateurs

Maryse Collin, Matthieu Romagny (organisateurs principaux), Xavier Caruso, Françoise Dal'Bo, Michel Gros, Frank Loray, Florian Méhats, Christophe Mourougane, Nicolas Raymond, San Vũ Ngọc

### Lieu

Tous les exposés ont lieu dans la salle 004-006, au rez-de-chaussée de l'IRMAR.

- Conference - Lebesgue PhD meeting 2016Oct 19, 2016 to Oct 21, 2016
Angers, from October 19th to October 21st

*Organization board*: Clément du Crest de Villeneuve, Clément Fromenteau, Guillaume Roux, Johan Leray*Scientific board*: Viet Anh Nguyen, Olivier Thom, Caroline Vernier - Conference - CAST - Contact and Symplectic TopologyJan 26, 2017 to Jan 28, 2017
Nantes, from January 26th to January 28th

*Organization board*: Baptiste Chantraine, Vincent Colin, Paolo Ghiggini*Scientific board*: Jean-François Barraud, Baptiste Chantraine, Kai Cieliebak, Tobias Ekholm - School - Flows and Limits in Kähler GeometryApr 18, 2017 to Apr 22, 2017
Nantes, from April 18th to April 22nd

*Organization board*: Sébastien Boucksom, Yann Rollin, Carl Tipler*Scientific board*: Claudio Arezzo, Olivier Biquard, Paul Gauduchon, Michael SingerKähler geometry is a very active research field, at the crossroads between algebraic and Riemannian geometry. Important breakthrough, that lead to solve the Yau-Tian-Donaldson conjecture in the Fano case, have been achieved recently. A spring school involving mini-lectures and talks around this thread of new ideas in Kähler geometry is organized at Nantes University. The goal of the school is to develop certain technical skills, useful to address a variety of important questions in algebraic geometry and global analysis on manifolds, aimed for PhD students and young researchers. Geometric flows, like the Kähler-Ricci flow for instance, and the associated quantification by the Donaldson dynamical system, will be among the essential tools dealt with during the school.

- Conference - Teichmüller Theory in Higher Dimension and Mirror SymmetryApr 24, 2017 to Apr 28, 2017
Angers, from April 24th to April 28th

*Organization board*: Frédéric Mangolte, Etienne Mann, Laurent Meersseman, Alexis RoquefeuilTeichmüller theory and mirror symmetry are very active domains. In this conference, we propose two series of lectures by two world leader mathematicians :

- Misha Verbitsky on Teichmüller theory
- Dimitri Zvonkine, University Pierre et Marie Curie

Speakers:

- Gaetan Borot, Max Planck Institut, Bonn
- Fabrizio Catanese, University of Bayreuth
- Amerik Ekaterina, University of Orsay (tbc)
- Maxim Kontsevich, IHES (tbc)
- Thomas Reichelt, University of Heidelberg
- Jacopo Stoppa, SISSA
- Claude Sabbah, Ecole polytechnique
- Andrei Teleman, University of Aix-Marseille

- Conference - Infinite measure DynamicsJun 6, 2017 to Jun 9, 2017
Brest, from June 6th to June 9th

*Organization board*: Yves Coudène, François Maucourant, Françoise Pène, Barbara Schapira, Samuel Tapie*Scientific board*: Jon Aaronson, Jean-Pierre Conze, Gilles Courtois, Domokos SzaszThis conference will focus on dynamical systems which naturally preserve a measure with infinite mass. These systems appear in a geometric or probabilistic context, or may come from natural sciences. When the invariant measure has infinite mass, recurrence is no longer automatic, usual mixing properties disappear and new asymptotical properties (such as rationnal ergodicity) may occur. Such systems may develop various and subtil behaviours, which could not exists in finite measure dynamics.

This conference will gather international experts on this topic, and will allow young researcher to have an easy access to the large recent developpment on such questions.

- Conference - Dynamics of algebraic transformationsJun 12, 2017 to Jun 16, 2017
Rennes, from June 12th to June 16th

*Organization board*: Serge Cantat, Christophe Dupont