Université Paris-Est Université Paris-Est - Marne-la-Vallée Université Paris-Est - Créteil Val-de-Marne Centre National de la Recherche Scientifique

UPEC

Time-frequency methods in gravitational-wave data analysis

Site: 
Date: 
21/06/2017 - 11:00 - 12:00
Salle: 
P1 P15
Orateur: 
KLIMENKO Sergey
Localisation: 
Courant Institute
Localisation: 
États-Unis
Résumé: 

First direct observation of gravitational waves opens new possibilities to explore our Universe. Gravitational waves probe the physics of the most cataclysmic astrophysical events such as supernovae explosions, gamma ray bursts and mergers of binary systems composing of neutron stars and black holes. Time-frequency methods are widely used in the gravitational-wave data analysis, particularly when the physics of the source is not well known. Often they are the only tool to capture and explore the dynamic evolution of the transient signals. In my talk I’ll describe the time-frequency algorithms used for the analysis of the gravitational-wave data and their application for identification and reconstruction of astrophysical sources.

MUCHA Piotr

Date: 
Mer, 31/05/2017 - Ven, 02/06/2017
Site: 
Nom: 
MUCHA
Prénom: 
Piotr
Origine: 
Université de Varsovie
Origine: 
Pologne
Thème: 
Analyse des EDP
Invitant: 
DANCHIN Raphaël

PIASECKI Tomasz

Date: 
Lun, 29/05/2017 - Ven, 02/06/2017
Site: 
Nom: 
PIASECKI
Prénom: 
Tomasz
Origine: 
Université de Varsovie
Origine: 
Pologne
Thème: 
Analyse des EDP
Invitant: 
DANCHIN Raphaël

Quantifications du tore et transformée de Bargmann.

Site: 
Date: 
15/06/2017 - 13:45 - 14:45
Salle: 
P2 - P12
Orateur: 
ROUBY Ophélie
Localisation: 
Université de Lisbonne
Localisation: 
Portugal
Résumé: 

On s'intéresse aux différentes quantifications du tore de dimension un et plus précisément à la quantification de Berezin-Toeplitz, à la quantification de Weyl et à la quantification de Weyl complexe, notion que nous allons définir comme une variante de la quantification de Weyl complexe de R^2 introduite par Johannes Sjöstrand. Le but de cet exposé est d'établir un lien entre ces différentes quantifications du tore notamment grâce à la transformée de Bargmann.

Global existence, blowup and scattering for large data supercritical and other wave equations

Site: 
Date: 
29/05/2017 - 15:15 - 16:15
Salle: 
P1 011
Orateur: 
SOFFER Avy
Localisation: 
Université Rutgers
Localisation: 
États-Unis

Global existence, blowup and scattering for large data supercritical and other wave equations

Site: 
Date: 
29/05/2017 - 14:00 - 15:00
Salle: 
P1 011
Orateur: 
SOFFER Avy
Localisation: 
Université Rutgers
Localisation: 
États-Unis

TALHOUK Raafat

Date: 
Lun, 15/05/2017 - Jeu, 18/05/2017
Site: 
Nom: 
TALHOUK
Prénom: 
Raafat
Origine: 
Université libanaise
Origine: 
Liban
Thème: 
Analyse des EDP
Invitant: 
GUILLOPÉ Colette

SOFFER Avy

Date: 
Mar, 09/05/2017 - Ven, 09/06/2017
Site: 
Nom: 
SOFFER
Prénom: 
Avy
Origine: 
Université Rutgers
Origine: 
États-Unis
Thème: 
Analyse des EDP
Invitant: 
PERELMAN Galina

Linear systems appear during simulating physical phenomena and optimisation problems

Site: 
Date: 
24/05/2017 - 14:00 - 15:00
Salle: 
P1-018
Orateur: 
AL DAAS Hussam
Localisation: 
Université Paris 6
Localisation: 
France
Résumé: 

In this presentation we will see a general background over iterative linear solvers and the bottlenecks prohibiting reducing the approximately 80 % of simulation time. This time is passed only to solve linear systems. These methods are widely used in both scientific and industrial fields. Parallelising these methods such that they are applied on supercomputers is natural since they rely on a matrix vector product and vector dot product. However, these operations are constrained by the communication time between processors. We will see a brief introduction to HPC. And finally, we will see how we could reduce the global communication by proposing multiple search directions variants.

Quasi-isometries harmoniques

Site: 
Date: 
29/05/2017 - 15:00 - 16:00
Salle: 
P2 131
Orateur: 
BENOIST Yves
Localisation: 
Université Paris 11
Localisation: 
France
Résumé: 

Nous verrons que toute application quasi-isométrique entre variétés de Hadamard pincées est à distance bornée d'une unique application harmonique.

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