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Rencontres GdR OG/ISIS

8 octobre 2018
Paris
Fuseau horaire Europe/Paris

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  1. 1. Tutoriel 1: Vue d'ensemble sur l'analyse de données pour l'astronomie gravitationnelle : principes, algorithmes et données ouvertes
    Florent Robinet (LAL - Orsay)
    08/10/2018 10:00
  2. 2. Tutoriel 2: Introduction à l'apprentissage statistique
    Stéphane Canu (LITIS, Rouen)
    08/10/2018 10:45
  3. 4. Overview about machine learning in gravitational wave astronomy
    Agata Trovato (INFN - LNS)
    08/10/2018 11:30

    We will give an overview of the current projects using machine learning in the context of gravitational wave astronomy, the results obtained so far and their potential impact.

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  4. 5. Tackling data analysis challenges in astrophysics with sparse matrix factorization methods
    Jerôme Bobin (CEA Irfu)
    08/10/2018 12:00

    In this presentation, we review some important applications of sparse matrix factorization (SMF) methods in astrophysical. In this context, such methods are playing a key role in the analysis of multi-frequency observations to disentangle between underlying astrophysical components. The first application will deal with the estimation of the most ancient relic radiation from the Big Bang,...

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  5. 3. Tutoriel 3: Revue et état de l'art sur les méthodes d'estimation bayésienne
    Nicolas Dobigeon (IRIT/INP-ENSEEIHT & IUF, Toulouse)
    08/10/2018 14:00
  6. 6. A Hamiltonian Monte Carlo sampler for compact binary sources
    Marc Arène (CNRS/IN2P3 APC)
    08/10/2018 14:45

    A major activity of the LIGO-Virgo collaboration is to build algorithms able to infer from the detected gravitational wave signals the posterior distributions of the parameters defining their sources: angles in the sky, distance from us, masses etc. Current algorithms like MCMC and Nested Sampling have already demonstrated with success their ability to do so during the first and second run of...

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  7. 7. Non-parametric Characterization of Gravitational-Wave Polarizations
    Julien Flamant (Cristal Lille)
    08/10/2018 15:30

    Gravitational waves are polarized. Their polarization is essential to characterize the physical and dynamical properties of the source i.e., a coalescing binary of two compact objects such as black holes or neutron stars. Observations with two or more non coaligned detectors like Virgo and LIGO allow to reconstruct the two polarization components usually denoted by h+(t) and h(t). The...

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  8. 8. Data analysis challenges with LISA: current status and prospects
    Nikolaos Karnesis (CNRS/IN2P3 APC)
    08/10/2018 16:00

    This talk will review the key issues that has to be addressed to extract the full science potential from the data of the LISA space mission. We will describe the LISA data challenges which will provide the main framework to develop and test data analysis algorithms.

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  9. 9. Analyse temps fréquence des ondes gravitationnelles en utilisant synchrosqueezing d’ordre supérieur
    Duong-Hung Pham (Gipsa-lab)
    08/10/2018 16:30

    Cet exposé présentera une analyse temps fréquence des ondes gravitationnelles en utilisant une nouvelle méthode: le synchrosqueezing d’ordre supérieur fondé sur la transformée de Fourier à court terme (TFCT). Tout d’abord, nous rappellerons le modèle mathématique de signal multicomposantes (SMCs) defini comme une superposition de modes modulés à la fois en amplitude et en fréquence (appelés...

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