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X-ORIGINAL-URL:https://www.math.ens.psl.eu
X-WR-CALDESC:évènements pour Département de mathématiques et applications
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TZID:Europe/Paris
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DTSTART:20260329T010000
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DTSTART:20261025T010000
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DTSTART:20270328T010000
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BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260914T110000
DTEND;TZID=Europe/Paris:20260914T120000
DTSTAMP:20260902T211506
CREATED:20260831T131336Z
LAST-MODIFIED:20260831T140729Z
UID:22026-1789383600-1789387200@www.math.ens.psl.eu
SUMMARY:Yueyun Hu - Deux applications des marches aléatoires branchantes avec sélection
DESCRIPTION:Les marches aléatoires branchantes avec sélection modélisent des populations de particules qui se déplacent et se reproduisent\, mais dont la croissance est limitée par un mécanisme de sélection. Dans cet exposé\, je présenterai deux applications de ce modèle : la première concerne la percolation par la moyenne sur le graphe complet\, la seconde le problème du couplage planté dans les graphes. Travaux en commun avec Elie Aïdékon et Dana Yang.
URL:https://www.math.ens.psl.eu/evenement/yueyun-hu-deux-applications-des-marches-aleatoires-branchantes-avec-selection/
LOCATION:Salle W (ENS)
CATEGORIES:Séminaire informel de probabilités
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260915T093000
DTEND;TZID=Europe/Paris:20260915T123000
DTSTAMP:20260902T211506
CREATED:20260717T113816Z
LAST-MODIFIED:20260902T173423Z
UID:21922-1789464600-1789475400@www.math.ens.psl.eu
SUMMARY:Helmut Abels – Diffuse Interface Models and their Sharp Interface Limits
DESCRIPTION:Interfaces separating two or more species or components of a material are omnipresent in applications in the sciences. Nowadays there are two main classes of models to describe interfaces\, both from a theoretical and practical point of view: In classical so-called « sharp interface models » the species or components under consideration fill disjoint domains that are separated by lower dimensional surfaces of a certain regularity. On the other hand in « diffuse interface models » a partial mixing of the species or components on a small length scale is taken into account\, which leads to an interfacial layer of small but positive thickness. This has the advantage that the interfaces do not need to be resolved explicitly and singularities in the interfaces can be described consistently.  \n\n\n\nIn the first part of the talk we will give an overview of some basic diffuse interface models with applications to material sciences. Moreover\, we will discuss some analytic results on the relation between diffuse and sharp interface models\, when the interfacial thickness of the diffuse interface tends to zero. The analysis is based on formally matched asymptotic expansions (in a rigorous manner) together with uniform estimates for the linearized operator. In this part we will focus on the Allen-Cahn equation as basic model. \n\n\n\nIn the second part we will discuss a Navier-Stokes/Allen-Cahn system\, which describes the flow of two macroscopically immiscible viscous incompressible fluid\, separated by a diffuse interface. We will present some recent results on novel higher-order estimates for the sharp interface limit of this system. With the aid of a suitable weight taking the distance to the interface and the interfacial thickness into account we obtain optimal regularity estimates\, which are uniformy in the interfacial thickness. This enables to improve previous convergence results in two space dimensions significantly and extend results to three space dimensions. This is a joint-work with Mingwen Fei\, Yadong Liu\, and Maximilian Moser.
URL:https://www.math.ens.psl.eu/evenement/helmut-abels-universitat-regensburg/
LOCATION:Salle W – ENS PSL\, 45 rue d'Ulm\, Paris\, 75005\, France
CATEGORIES:Séminaire Analyse non linéaire et EDP
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20261013T093000
DTEND;TZID=Europe/Paris:20261013T123000
DTSTAMP:20260902T211506
CREATED:20260717T114044Z
LAST-MODIFIED:20260717T114045Z
UID:21924-1791883800-1791894600@www.math.ens.psl.eu
SUMMARY:Thierry Gallay (Université Grenoble Alpes)
DESCRIPTION:
URL:https://www.math.ens.psl.eu/evenement/thierry-gallay-universite-grenoble-alpes/
LOCATION:Campus de Jussieu salle 309 3e étage barre 15-16
CATEGORIES:Séminaire Analyse non linéaire et EDP
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20261111T093000
DTEND;TZID=Europe/Paris:20261111T123000
DTSTAMP:20260902T211506
CREATED:20260717T114620Z
LAST-MODIFIED:20260717T114620Z
UID:21923-1794389400-1794400200@www.math.ens.psl.eu
SUMMARY:Monica Musso (University of Bath)
DESCRIPTION:
URL:https://www.math.ens.psl.eu/evenement/monica-musso-university-of-bath/
LOCATION:Campus de Jussieu salle 309 3e étage barre 15-16
CATEGORIES:Séminaire Analyse non linéaire et EDP
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20261208T093000
DTEND;TZID=Europe/Paris:20261208T123000
DTSTAMP:20260902T211506
CREATED:20260717T114803Z
LAST-MODIFIED:20260717T114803Z
UID:21925-1796722200-1796733000@www.math.ens.psl.eu
SUMMARY:Jonathan Luk (Stanford University)
DESCRIPTION:
URL:https://www.math.ens.psl.eu/evenement/jonathan-luk-stanford-university/
LOCATION:Salle W – ENS PSL\, 45 rue d'Ulm\, Paris\, 75005\, France
CATEGORIES:Séminaire Analyse non linéaire et EDP
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20270202T093000
DTEND;TZID=Europe/Paris:20270202T123000
DTSTAMP:20260902T211506
CREATED:20260717T114936Z
LAST-MODIFIED:20260717T114940Z
UID:21927-1801560600-1801571400@www.math.ens.psl.eu
SUMMARY:Alexander Kiselev (Duke University)
DESCRIPTION:
URL:https://www.math.ens.psl.eu/evenement/alexander-kiselev-duke-university/
LOCATION:Salle W – ENS PSL\, 45 rue d'Ulm\, Paris\, 75005\, France
CATEGORIES:Séminaire Analyse non linéaire et EDP
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20270316T093000
DTEND;TZID=Europe/Paris:20270316T123000
DTSTAMP:20260902T211506
CREATED:20260717T115057Z
LAST-MODIFIED:20260717T115057Z
UID:21926-1805189400-1805200200@www.math.ens.psl.eu
SUMMARY:Pin Yu (Tsinghua University)
DESCRIPTION:
URL:https://www.math.ens.psl.eu/evenement/pin-yu-tsinghua-university/
LOCATION:Campus de Jussieu salle 309 3e étage barre 15-16
CATEGORIES:Séminaire Analyse non linéaire et EDP
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20270420T093000
DTEND;TZID=Europe/Paris:20270420T123000
DTSTAMP:20260902T211506
CREATED:20260717T115220Z
LAST-MODIFIED:20260717T115221Z
UID:21928-1808213400-1808224200@www.math.ens.psl.eu
SUMMARY:Michael Goldman (École Polytechnique)
DESCRIPTION:
URL:https://www.math.ens.psl.eu/evenement/michael-goldman-ecole-polytechnique/
LOCATION:Salle W – ENS PSL\, 45 rue d'Ulm\, Paris\, 75005\, France
CATEGORIES:Séminaire Analyse non linéaire et EDP
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20270518T093000
DTEND;TZID=Europe/Paris:20270518T123000
DTSTAMP:20260902T211506
CREATED:20260717T115410Z
LAST-MODIFIED:20260717T115411Z
UID:21929-1810632600-1810643400@www.math.ens.psl.eu
SUMMARY:Louise Gassot (Université de Rennes)
DESCRIPTION:
URL:https://www.math.ens.psl.eu/evenement/louise-gassot-universite-de-rennes/
LOCATION:Campus de Jussieu salle 309 3e étage barre 15-16
CATEGORIES:Séminaire Analyse non linéaire et EDP
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20270622T093000
DTEND;TZID=Europe/Paris:20270622T123000
DTSTAMP:20260902T211506
CREATED:20260717T115542Z
LAST-MODIFIED:20260717T115543Z
UID:21930-1813656600-1813667400@www.math.ens.psl.eu
SUMMARY:Mihaela Ifrim (University of Wisconsin-Madison
DESCRIPTION:
URL:https://www.math.ens.psl.eu/evenement/mihaela-ifrim-university-of-wisconsin-madison/
LOCATION:Salle W – ENS PSL\, 45 rue d'Ulm\, Paris\, 75005\, France
CATEGORIES:Séminaire Analyse non linéaire et EDP
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