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  • New numerical schemes for extreme geophysical phenomena
    Sep 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

    website of the conference

  • Journée d'information et de réflexion sur l'édition scientifique
    Sep 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 2016
    Oct 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 Topology
    Jan 26, 2017 to Jan 28, 2017

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    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 Geometry
    Apr 18, 2017 to Apr 22, 2017

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    Nantes, from April 18th to April 22nd

    Organization board: Sébastien Boucksom, Yann Rollin, Carl Tipler

    Scientific board: Claudio Arezzo, Olivier Biquard, Paul Gauduchon, Michael Singer

    Kähler 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 Symmetry
    Apr 24, 2017 to Apr 28, 2017

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    Angers, from April 24th to April 28th

    Organization board: Frédéric Mangolte, Etienne Mann, Laurent Meersseman, Alexis Roquefeuil

    Teichmüller 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 Dynamics
    Jun 6, 2017 to Jun 9, 2017

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    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 Szasz

    This 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 transformations
    Jun 12, 2017 to Jun 16, 2017

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    Rennes, from June 12th to June 16th

    Organization board: Serge Cantat, Christophe Dupont

Conference - Effective moduli spaces and applications to cryptography

Rennes, from June 10th to June 13th, 2014
Contact: D. Lubicz
Organisation board: M. Bolognesi, D. Lubicz, C. Ritzenthaler

Moduli spaces are parameter spaces for mathematical objects equipped (or not) with extra structures. The cases of spaces classifying curves and abelian varieties have been widely studied in their theoretical aspects which entailed dramatic advances in arithmetic geometry. Nonetheless, more effective aspects for instance related to rationality questions or depending on the characteristic of the base field are less well understood. Certain field of applications require tools and algorithms to manipulate efficiently these moduli spaces. This is case for instance of public key cryptography since certain cryptosystems have public parameters which naturally live inside certain moduli spaces.

This conference aims at gathering specialists of moduli spaces of curves and abelian varieties, algorithmic and cryptography so as to explore the deep link and the possible interactions between theoretical and practical aspects of moduli spaces.

Partners

Affiliation

ANR CNRS Rennes 1 Rennes 2 Nantes INSA Rennes INRIA ENSRennes UBL