Focaliser sur:
Toutes les sessions
Accueil
Conclusions
Cacher les contributions
Indico style
Indico style - inline minutes
Indico style - numbered
Indico style - numbered + minutes
Indico Weeks View
Choisissez le fuseau horaire
Utiliser le fuseau horaire de l'événement/catégorie
Veuillez spécifier un fuseau horaire
Africa/Abidjan
Africa/Accra
Africa/Addis_Ababa
Africa/Algiers
Africa/Asmara
Africa/Bamako
Africa/Bangui
Africa/Banjul
Africa/Bissau
Africa/Blantyre
Africa/Brazzaville
Africa/Bujumbura
Africa/Cairo
Africa/Casablanca
Africa/Ceuta
Africa/Conakry
Africa/Dakar
Africa/Dar_es_Salaam
Africa/Djibouti
Africa/Douala
Africa/El_Aaiun
Africa/Freetown
Africa/Gaborone
Africa/Harare
Africa/Johannesburg
Africa/Juba
Africa/Kampala
Africa/Khartoum
Africa/Kigali
Africa/Kinshasa
Africa/Lagos
Africa/Libreville
Africa/Lome
Africa/Luanda
Africa/Lubumbashi
Africa/Lusaka
Africa/Malabo
Africa/Maputo
Africa/Maseru
Africa/Mbabane
Africa/Mogadishu
Africa/Monrovia
Africa/Nairobi
Africa/Ndjamena
Africa/Niamey
Africa/Nouakchott
Africa/Ouagadougou
Africa/Porto-Novo
Africa/Sao_Tome
Africa/Tripoli
Africa/Tunis
Africa/Windhoek
America/Adak
America/Anchorage
America/Anguilla
America/Antigua
America/Araguaina
America/Argentina/Buenos_Aires
America/Argentina/Catamarca
America/Argentina/Cordoba
America/Argentina/Jujuy
America/Argentina/La_Rioja
America/Argentina/Mendoza
America/Argentina/Rio_Gallegos
America/Argentina/Salta
America/Argentina/San_Juan
America/Argentina/San_Luis
America/Argentina/Tucuman
America/Argentina/Ushuaia
America/Aruba
America/Asuncion
America/Atikokan
America/Bahia
America/Bahia_Banderas
America/Barbados
America/Belem
America/Belize
America/Blanc-Sablon
America/Boa_Vista
America/Bogota
America/Boise
America/Cambridge_Bay
America/Campo_Grande
America/Cancun
America/Caracas
America/Cayenne
America/Cayman
America/Chicago
America/Chihuahua
America/Ciudad_Juarez
America/Costa_Rica
America/Creston
America/Cuiaba
America/Curacao
America/Danmarkshavn
America/Dawson
America/Dawson_Creek
America/Denver
America/Detroit
America/Dominica
America/Edmonton
America/Eirunepe
America/El_Salvador
America/Fort_Nelson
America/Fortaleza
America/Glace_Bay
America/Goose_Bay
America/Grand_Turk
America/Grenada
America/Guadeloupe
America/Guatemala
America/Guayaquil
America/Guyana
America/Halifax
America/Havana
America/Hermosillo
America/Indiana/Indianapolis
America/Indiana/Knox
America/Indiana/Marengo
America/Indiana/Petersburg
America/Indiana/Tell_City
America/Indiana/Vevay
America/Indiana/Vincennes
America/Indiana/Winamac
America/Inuvik
America/Iqaluit
America/Jamaica
America/Juneau
America/Kentucky/Louisville
America/Kentucky/Monticello
America/Kralendijk
America/La_Paz
America/Lima
America/Los_Angeles
America/Lower_Princes
America/Maceio
America/Managua
America/Manaus
America/Marigot
America/Martinique
America/Matamoros
America/Mazatlan
America/Menominee
America/Merida
America/Metlakatla
America/Mexico_City
America/Miquelon
America/Moncton
America/Monterrey
America/Montevideo
America/Montserrat
America/Nassau
America/New_York
America/Nome
America/Noronha
America/North_Dakota/Beulah
America/North_Dakota/Center
America/North_Dakota/New_Salem
America/Nuuk
America/Ojinaga
America/Panama
America/Paramaribo
America/Phoenix
America/Port-au-Prince
America/Port_of_Spain
America/Porto_Velho
America/Puerto_Rico
America/Punta_Arenas
America/Rankin_Inlet
America/Recife
America/Regina
America/Resolute
America/Rio_Branco
America/Santarem
America/Santiago
America/Santo_Domingo
America/Sao_Paulo
America/Scoresbysund
America/Sitka
America/St_Barthelemy
America/St_Johns
America/St_Kitts
America/St_Lucia
America/St_Thomas
America/St_Vincent
America/Swift_Current
America/Tegucigalpa
America/Thule
America/Tijuana
America/Toronto
America/Tortola
America/Vancouver
America/Whitehorse
America/Winnipeg
America/Yakutat
Antarctica/Casey
Antarctica/Davis
Antarctica/DumontDUrville
Antarctica/Macquarie
Antarctica/Mawson
Antarctica/McMurdo
Antarctica/Palmer
Antarctica/Rothera
Antarctica/Syowa
Antarctica/Troll
Antarctica/Vostok
Arctic/Longyearbyen
Asia/Aden
Asia/Almaty
Asia/Amman
Asia/Anadyr
Asia/Aqtau
Asia/Aqtobe
Asia/Ashgabat
Asia/Atyrau
Asia/Baghdad
Asia/Bahrain
Asia/Baku
Asia/Bangkok
Asia/Barnaul
Asia/Beirut
Asia/Bishkek
Asia/Brunei
Asia/Chita
Asia/Choibalsan
Asia/Colombo
Asia/Damascus
Asia/Dhaka
Asia/Dili
Asia/Dubai
Asia/Dushanbe
Asia/Famagusta
Asia/Gaza
Asia/Hebron
Asia/Ho_Chi_Minh
Asia/Hong_Kong
Asia/Hovd
Asia/Irkutsk
Asia/Jakarta
Asia/Jayapura
Asia/Jerusalem
Asia/Kabul
Asia/Kamchatka
Asia/Karachi
Asia/Kathmandu
Asia/Khandyga
Asia/Kolkata
Asia/Krasnoyarsk
Asia/Kuala_Lumpur
Asia/Kuching
Asia/Kuwait
Asia/Macau
Asia/Magadan
Asia/Makassar
Asia/Manila
Asia/Muscat
Asia/Nicosia
Asia/Novokuznetsk
Asia/Novosibirsk
Asia/Omsk
Asia/Oral
Asia/Phnom_Penh
Asia/Pontianak
Asia/Pyongyang
Asia/Qatar
Asia/Qostanay
Asia/Qyzylorda
Asia/Riyadh
Asia/Sakhalin
Asia/Samarkand
Asia/Seoul
Asia/Shanghai
Asia/Singapore
Asia/Srednekolymsk
Asia/Taipei
Asia/Tashkent
Asia/Tbilisi
Asia/Tehran
Asia/Thimphu
Asia/Tokyo
Asia/Tomsk
Asia/Ulaanbaatar
Asia/Urumqi
Asia/Ust-Nera
Asia/Vientiane
Asia/Vladivostok
Asia/Yakutsk
Asia/Yangon
Asia/Yekaterinburg
Asia/Yerevan
Atlantic/Azores
Atlantic/Bermuda
Atlantic/Canary
Atlantic/Cape_Verde
Atlantic/Faroe
Atlantic/Madeira
Atlantic/Reykjavik
Atlantic/South_Georgia
Atlantic/St_Helena
Atlantic/Stanley
Australia/Adelaide
Australia/Brisbane
Australia/Broken_Hill
Australia/Darwin
Australia/Eucla
Australia/Hobart
Australia/Lindeman
Australia/Lord_Howe
Australia/Melbourne
Australia/Perth
Australia/Sydney
Canada/Atlantic
Canada/Central
Canada/Eastern
Canada/Mountain
Canada/Newfoundland
Canada/Pacific
Europe/Amsterdam
Europe/Andorra
Europe/Astrakhan
Europe/Athens
Europe/Belgrade
Europe/Berlin
Europe/Bratislava
Europe/Brussels
Europe/Bucharest
Europe/Budapest
Europe/Busingen
Europe/Chisinau
Europe/Copenhagen
Europe/Dublin
Europe/Gibraltar
Europe/Guernsey
Europe/Helsinki
Europe/Isle_of_Man
Europe/Istanbul
Europe/Jersey
Europe/Kaliningrad
Europe/Kirov
Europe/Kyiv
Europe/Lisbon
Europe/Ljubljana
Europe/London
Europe/Luxembourg
Europe/Madrid
Europe/Malta
Europe/Mariehamn
Europe/Minsk
Europe/Monaco
Europe/Moscow
Europe/Oslo
Europe/Paris
Europe/Podgorica
Europe/Prague
Europe/Riga
Europe/Rome
Europe/Samara
Europe/San_Marino
Europe/Sarajevo
Europe/Saratov
Europe/Simferopol
Europe/Skopje
Europe/Sofia
Europe/Stockholm
Europe/Tallinn
Europe/Tirane
Europe/Ulyanovsk
Europe/Vaduz
Europe/Vatican
Europe/Vienna
Europe/Vilnius
Europe/Volgograd
Europe/Warsaw
Europe/Zagreb
Europe/Zurich
GMT
Indian/Antananarivo
Indian/Chagos
Indian/Christmas
Indian/Cocos
Indian/Comoro
Indian/Kerguelen
Indian/Mahe
Indian/Maldives
Indian/Mauritius
Indian/Mayotte
Indian/Reunion
Pacific/Apia
Pacific/Auckland
Pacific/Bougainville
Pacific/Chatham
Pacific/Chuuk
Pacific/Easter
Pacific/Efate
Pacific/Fakaofo
Pacific/Fiji
Pacific/Funafuti
Pacific/Galapagos
Pacific/Gambier
Pacific/Guadalcanal
Pacific/Guam
Pacific/Honolulu
Pacific/Kanton
Pacific/Kiritimati
Pacific/Kosrae
Pacific/Kwajalein
Pacific/Majuro
Pacific/Marquesas
Pacific/Midway
Pacific/Nauru
Pacific/Niue
Pacific/Norfolk
Pacific/Noumea
Pacific/Pago_Pago
Pacific/Palau
Pacific/Pitcairn
Pacific/Pohnpei
Pacific/Port_Moresby
Pacific/Rarotonga
Pacific/Saipan
Pacific/Tahiti
Pacific/Tarawa
Pacific/Tongatapu
Pacific/Wake
Pacific/Wallis
US/Alaska
US/Arizona
US/Central
US/Eastern
US/Hawaii
US/Mountain
US/Pacific
UTC
Sauver
Europe/Paris
Français
Deutsch (Deutschland)
English (United Kingdom)
English (United States)
Español (España)
Français (France)
Italiano (Italia)
Polski (Polska)
Português (Brasil)
Türkçe (Türkiye)
Čeština (Česko)
Монгол (Монгол)
Українська (Україна)
中文 (中国)
S'authentifier
Rencontres GdR OG/ISIS
lundi 8 octobre 2018 -
00:00
lundi 8 octobre 2018
09:30
09:30 - 10:00
Room: Univ Paris Diderot -- UFR Physique, Amphi Pierre-Gilles de Gennes
10:00
Tutoriel 1: Vue d'ensemble sur l'analyse de données pour l'astronomie gravitationnelle : principes, algorithmes et données ouvertes
-
Florent Robinet
(
LAL - Orsay
)
Tutoriel 1: Vue d'ensemble sur l'analyse de données pour l'astronomie gravitationnelle : principes, algorithmes et données ouvertes
Florent Robinet
(
LAL - Orsay
)
10:00 - 10:45
Room: Univ Paris Diderot -- UFR Physique, Amphi Pierre-Gilles de Gennes
10:45
Tutoriel 2: Introduction à l'apprentissage statistique
-
Stéphane Canu
(
LITIS, Rouen
)
Tutoriel 2: Introduction à l'apprentissage statistique
Stéphane Canu
(
LITIS, Rouen
)
10:45 - 11:30
Room: Univ Paris Diderot -- UFR Physique, Amphi Pierre-Gilles de Gennes
11:30
Overview about machine learning in gravitational wave astronomy
-
Agata Trovato
(
INFN - LNS
)
Overview about machine learning in gravitational wave astronomy
Agata Trovato
(
INFN - LNS
)
11:30 - 12:00
Room: Univ Paris Diderot -- UFR Physique, Amphi Pierre-Gilles de Gennes
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.
12:00
Tackling data analysis challenges in astrophysics with sparse matrix factorization methods
-
Jerôme Bobin
(
CEA Irfu
)
Tackling data analysis challenges in astrophysics with sparse matrix factorization methods
Jerôme Bobin
(
CEA Irfu
)
12:00 - 12:30
Room: Univ Paris Diderot -- UFR Physique, Amphi Pierre-Gilles de Gennes
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, a.k.a. Cosmological Microwave Background (CMB), from the Planck data. In this scope, we will emphasize on how sparse matrix factorization is performed on microwave full-sky data and how sparsity largely helps disentangling between the sought-after CMB and the spurious "foreground" components. The second example will emphasize on the extension of these methods to analyse radio-interferometric measurements, in preparation of the forthcoming very large radio-telescopes such as the Square Kilometer Array (SKA). In contrast to the previous case, component separation has to be performed from incomplete data: the data (or so called visibilities) are equivalent to a subsampling in the Fourier space. In plain english, this means that one has access to only few samples. In this case, we will introduce an extension of SMF that is specifically tailored to deal with incomplete data, with illustrations from radio-interferometric measurements.
12:30
Repas [buffet sur place]
Repas [buffet sur place]
12:30 - 14:00
Room: Univ Paris Diderot -- UFR Physique, Amphi Pierre-Gilles de Gennes
14:00
Tutoriel 3: Revue et état de l'art sur les méthodes d'estimation bayésienne
-
Nicolas Dobigeon
(
IRIT/INP-ENSEEIHT & IUF, Toulouse
)
Tutoriel 3: Revue et état de l'art sur les méthodes d'estimation bayésienne
Nicolas Dobigeon
(
IRIT/INP-ENSEEIHT & IUF, Toulouse
)
14:00 - 14:45
Room: Univ Paris Diderot -- UFR Physique, Amphi Pierre-Gilles de Gennes
14:45
A Hamiltonian Monte Carlo sampler for compact binary sources
-
Marc Arène
(
CNRS/IN2P3 APC
)
A Hamiltonian Monte Carlo sampler for compact binary sources
Marc Arène
(
CNRS/IN2P3 APC
)
14:45 - 15:15
Room: Univ Paris Diderot -- UFR Physique, Amphi Pierre-Gilles de Gennes
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 observations of the detectors. However with the third round of observations coming in 2019 we expect much higher rates of detections and hence the need for faster algorithms. I will present here how a Hamiltonian Monte Carlo sampler can respond to this challenge when designed appropriately.
15:15
Café
Café
15:15 - 15:30
Room: Univ Paris Diderot -- UFR Physique, Amphi Pierre-Gilles de Gennes
15:30
Non-parametric Characterization of Gravitational-Wave Polarizations
-
Julien Flamant
(
Cristal Lille
)
Non-parametric Characterization of Gravitational-Wave Polarizations
Julien Flamant
(
Cristal Lille
)
15:30 - 16:00
Room: Univ Paris Diderot -- UFR Physique, Amphi Pierre-Gilles de Gennes
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 amplitude and phase relationship between the two components is related to the source orientation with respect to the observer. Therefore the evolution of the polarization pattern provides evidence for changes in the orientation due to precession or nutation of the binary. Usually, some specific direct dynamical model is exploited to identify the physical parameters of such binaries. Recently, a new framework for the time-frequency analysis of bivariate signals based on a quaternion Fourier transform has been introduced in [1]. It permits to analyze the bivariate signal combining h+(t) and h(t) by defining its quaternion embedding as well as a set of non-parametric observables, namely Stokes parameters. These parameters are remarkably capable of measuring fine properties of the source, in particular by deciphering precession, without close bounds to a specific dynamical model.
16:00
Data analysis challenges with LISA: current status and prospects
-
Nikolaos Karnesis
(
CNRS/IN2P3 APC
)
Data analysis challenges with LISA: current status and prospects
Nikolaos Karnesis
(
CNRS/IN2P3 APC
)
16:00 - 16:30
Room: Univ Paris Diderot -- UFR Physique, Amphi Pierre-Gilles de Gennes
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.
16:30
Analyse temps fréquence des ondes gravitationnelles en utilisant synchrosqueezing d’ordre supérieur
-
Duong-Hung Pham
(
Gipsa-lab
)
Analyse temps fréquence des ondes gravitationnelles en utilisant synchrosqueezing d’ordre supérieur
Duong-Hung Pham
(
Gipsa-lab
)
16:30 - 17:00
Room: Univ Paris Diderot -- UFR Physique, Amphi Pierre-Gilles de Gennes
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 modes AM-FMs). Pour l’analyse de tels signaux, la TFCT est une méthode très utilisée, mais a une limitation intrinsèque appelée le principe d’incertitude de Heisenberg-Gabor concernant la localisation en temps et en fréquence du signal. La méthode de réallocation a été proposée pour pallier cette limitation, mais elle est non inversible, c’est-à-dire qu’elle ne permet pas la reconstruction des modes à partir des transformées réallouées. Pour éliminer ce défaut, la méthode du synchoqueezing fondée sur la TFCT (FSST) a été développée. Néanmoins, cette méthode est seulement adaptée aux signaux contenant des modes de type chirp linéaires avec des amplitudes Gaussiennes modulées, ce qui constitue encore une limitation pour le traitement de signaux plus généraux. Pour mieux traiter de signaux comportant de très fortes modulations fréquentielles, la méthode du synchoqueezing d’ordre supérieur se fondant sur la TFCT (FSSTn) a été récemment proposé. Dans cet exposé, nous présenterons en détail des étapes principales du développement d’une telle technique et une application intéressante à l’analyse de signaux comportant de très fortes modulations fréquentielles : les ondes gravitationnelles.
17:00
17:00 - 17:10
Room: Univ Paris Diderot -- UFR Physique, Amphi Pierre-Gilles de Gennes