Focaliser sur:
Tous les jours
26 oct. 2022
27 oct. 2022
28 oct. 2022
Indico style
Indico style - inline minutes
Indico style - numbered
Indico style - numbered + minutes
Indico Weeks View
Retour à l'affichage de la conférence
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
EDP et Probabilité
de
mercredi 26 octobre 2022 (11:00)
à
vendredi 28 octobre 2022 (17:00)
lundi 24 octobre 2022
mardi 25 octobre 2022
mercredi 26 octobre 2022
12:00
Buffet + Accueil
Buffet + Accueil
12:00 - 14:00
14:00
C. Rojas-Molina: Open questions for fractional random Schrödinger operators
C. Rojas-Molina: Open questions for fractional random Schrödinger operators
14:00 - 15:00
We review some recent results on the fractional Anderson model, a random Schrödinger operator driven by a fractional laplacian. The interest on the latter lies in their association to stable Levy processes, random walks with long jumps and anomalous diffusion. While in certain regimes, the standard proofs of localization break down in this setting, we can still gather information about the integrated density of states and obtain estimates on the decay of the Green’s function through a link to long-range self-avoiding random walks that exists in the case of random perturbations of the Laplacian. This is based on joint work with M. Gebert, and with M. Disertori and R. Maturana Escobar.
15:00
G. Cane: Superdiffusion transition for a noisy harmonic chain subject to a magnetic field
G. Cane: Superdiffusion transition for a noisy harmonic chain subject to a magnetic field
15:00 - 16:00
Understanding the diffusive or superdiffusive behavior of the energy in classical physical systems is challenging because of the non-linearity of the interactions between the particles. A way to reduce the difficulty is to replace the nonlinearity by a stochastic noise. In this presentation I will consider a noisy harmonic chain subjected to a magnetic field. We will see that according to the intensity of the magnetic field, the superdiffusive nature of the system changes.
16:00
Pause café
Pause café
16:00 - 16:30
16:30
A. Richou: About conditional expectation in a non convex set
A. Richou: About conditional expectation in a non convex set
16:30 - 17:30
In this talk, I will explain how to define a good notion of conditional expectation constrained to live in a non convex smooth domain of $R^d$. I will present some existence and uniqueness results obtained with J.-F. Chassagneux (Univ. Paris Cité) and S. Nadtochiy (IIT Chicago) under appropriate assumptions. I will also explain how to improve our results in dimension 2 by using a more geometric approach. This last part is a work in progress with M. Arnaudon (Univ. Bordeaux), J.-F. Chassagneux (Univ. Paris Cité) and S. Nadtochiy (IIT Chicago).
jeudi 27 octobre 2022
09:00
A. Gloria - ZOOM - The landscape function in Rd
A. Gloria - ZOOM - The landscape function in Rd
09:00 - 10:00
In this talk I will describe the landscape function, a quantity introduced by Filoche and Mayboroda ten years ago in order to study localization phenomena for random Schrödinger operators. In the first part I will quickly discuss the striking fact that the landscape function ac curately predicts the support of localized eigenstates and their energy in bounded domains. In the main part of the talk I will show how to define the landscape function in the whole space, and characterise its correlations. The main ingredient is the exponential decay of the Green function of the random Schrödinger oper- ator, which I shall establish. This is a joint work with Guy David and Svitlana Mayboroda.
10:00
Pause café
Pause café
10:00 - 10:30
10:30
S. Brull: Fredholm property of the linearized Boltzmann operator for a mixture of polyatomic gases
S. Brull: Fredholm property of the linearized Boltzmann operator for a mixture of polyatomic gases
10:30 - 11:30
In this talk I will present the proof of the Fredholm alternative for the linearized Boltzmann operator. The model is describded with a distribution function with an additional continous energy variable. The collision operator is based on the Borgnakke-Larsen procedure. We present the proof in the case of a single gas and of mixtures. The cornerstone of the proof is the introduction of a kernel on the perturbation part in order to prove that the operator is Hilbert Schmidt.
11:30
P. Gervais: On the Boltzmann equation for long-range interactions close to equilibrium
P. Gervais: On the Boltzmann equation for long-range interactions close to equilibrium
11:30 - 12:30
The Boltzmann equation, introduced by J.C. Maxwell and L. Boltzmann at the end of the 19th century, describes the evolution of a gas at the molecular level using a statistical point of view. More precisely, instead of considering the exact position and velocity of each of the particles making up the gas, we are interested in their statistical distributions for a typical particle. One of the main mathematical difficulties of this equation comes from the interactions between pairs of ”distant” particles. Considered individually, they have little influence on the velocities of the particles, but are extremely frequent, which results in the presence of an ”angular singularity” in the operator modeling their effect. This difficulty is responsible for the very slow evolution of the mathematical theory of the Boltzmann equation. In 1963, H. Grad proposed a way to neglect this singularity, leading to a rapid progress in our understanding of this equation. This angular singularity is however not insignificant, it provides among other things a regularizing effect to the equation, and has been studied in many works since the 1990s. In this talk I will present how to construct solutions to the Boltzmann equation close to equilibrium.
12:30
Déjeuner
Déjeuner
12:30 - 14:30
14:30
M. Arnaudon: Coupling of Brownian motions with set valued dual processes on Riemannian manifolds
M. Arnaudon: Coupling of Brownian motions with set valued dual processes on Riemannian manifolds
14:30 - 15:30
In this talk we will motivate and explain the evolution by renormalized stochastic mean curvature flow, of boundaries of relatively compact connected domains in a Riemannian manifolds. We will construct coupled Brownian motions inside the moving domains, satisfying a Markov intertwining relation. We will prove that the Brownian motions perform perfect simulation of uniform law, when the domain reaches the whole manifold. We will investigate the example of evolution of discs in spheres, and of symmetric domains in the Euclidean plane. Skeletons of moving domains will play a major role.
15:30
A. Mouzard: A random continuum polymer associated to the Anderson Hamiltonian on compact surfaces
A. Mouzard: A random continuum polymer associated to the Anderson Hamiltonian on compact surfaces
15:30 - 16:30
In this talk, I will present the construction of a random continuum polymer in the presence of a spatial white noise on compact surfaces. This relies on the continuous Anderson Hamiltonian, that is the random Schrödinger operator with white noise potential. The description of the spectral properties of this random operator is obtained using the tools of paracontrolled calculs recently developed to solve singular stochastic PDEs.
16:30
Pause café
Pause café
16:30 - 17:00
17:00
P. Diaconis - ZOOM - Random walk on the Rado graph and Hardy’s inequality for trees
P. Diaconis - ZOOM - Random walk on the Rado graph and Hardy’s inequality for trees
17:00 - 18:00
The Rado graph $R$ is a natural limit of the set of all finite graphs. One way to think of it is: on ${\mathbb N}$ (natural numbers) flip a fair coin for each pair of vertices and put an edge in if it comes up heads. Each vertex has infinite degree and the diameter is $2$. In joint work with Sourav Chatterjee and Laurent Miclo we study a natural laplacian: pick a positive probability $Q(j)$ on ${\mathbb N}$. From $i$, the walk chooses a nearest neighbor of $i$ (in $R$) with probability proportional to $Q(j)$.This walk has a stationary distribution and one may ask about rates of convergence to stationarity. The main result studies $Q(i) = 1/2^{(i+1)}$ and shows that, starting from $i$, $ {\rm log}^*_2 i$ steps suffice for convergence and, are needed for infinitely many $i$. The analysis uses a novel form of weighted Hardy inequalities for trees; Hardy’s inequalities with weights are familiar on ${\mathbb R}$ but even on ${\mathbb R}^{d}$ are a poorly developed tool. We develop the version on infinite trees and use it to get a spectral gap for the walk and to give a new picture of the geometry of the graph $R$. I will try to explain $R$ and Hardy’s inequalities (and the application) in ’mathematical English’. Understanding the problem for other $Q$ (eg $Q(j) = 1/j^2 $) is open.
20:00
Dîner au "Le Plana" - 22 Place de la Victoire - Bordeaux
Dîner au "Le Plana" - 22 Place de la Victoire - Bordeaux
20:00 - 23:00
vendredi 28 octobre 2022
09:00
B. Helffer: Quantum tunneling in deep potential wells and strong magnetic field revisited
B. Helffer: Quantum tunneling in deep potential wells and strong magnetic field revisited
09:00 - 10:00
Inspired by a recent paper by C. Fefferman, J. Shapiro and M. Weinstein, we investigate quantum tunneling for a Hamiltonian with a symmetric double well and a uniform magnetic field. In the simultaneous limit of strong magnetic field and deep potential wells with disjoint supports, tunneling occurs and we derive accurate estimates of its magnitude. This talk is based on a joint work with A. Kachmar.
10:00
Pause café
Pause café
10:00 - 10:30
10:30
B. Bogosel: On the polygonal Faber-Krahn inequality
B. Bogosel: On the polygonal Faber-Krahn inequality
10:30 - 11:30
It has been conjectured by Pólya and Szegö in 1951 that among n-gons with fixed area the regular one minimizes the first eigenvalue of the Dirichlet-Laplace operator. Despite its apparent simplicity, this result has only been proved for triangles and quadrilaterals. In this work we show that the proof of the conjecture can be reduced to finitely many certified numerical computations. Moreover, the local minimality of the regular polygon is reduced to a single validated numerical computation. The steps of the proof strategy include the analytic computation of the Hessian matrix of the first eigenvalue, the stability of the Hessian with respect to vertex perturbations and analytic upper bounds for the diameter of an optimal set. Explicit a priori error estimates are given for the finite element computation of the eigenvalues of the Hessian matrix of the first eigenvalue associated to the regular polygon. Results presented are obtained in collaboration with Dorin Bucur.
11:30
M. Vogel: Eigenvector localization and delocalization of noisy non selfadjoint operators
M. Vogel: Eigenvector localization and delocalization of noisy non selfadjoint operators
11:30 - 12:30
It is now very well established that small random perturbations lead to probabilistic Weyl laws for the eigenvalue asymptotics of non-selfadjoint semiclassical pseudo-differential operators, Berezin-Toeplitz quantizations of compact Kähler manifolds and Toeplitz matrices. In this talk, I will I present recent work in collaboration with Anirban Basak and Ofer Zeitouni on eigenvector localization and delocalization in the model case of large non-selfadjoint Toeplitz matrices with small random perturbations.
12:30
Déjeuner au "Yamato" de Talence
Déjeuner au "Yamato" de Talence
12:30 - 14:30
14:30
M. Slowik: Metastability of Glauber dynamics with inhomogeneous coupling disorder
M. Slowik: Metastability of Glauber dynamics with inhomogeneous coupling disorder
14:30 - 15:30
Metastability is a phenomenon that occurs in the dynamics of a multi-stable non-linear system subject to noise. It is characterised by the existence of multiple, well separated time scales. The talk will be focused on the metastable behaviour of a general class of mean-field-like spin systems with random couplings that evolve according to a Glauber dynamics at fixed temperature. This class of systems comprises both the Ising model on inhomogeneous dense random graphs and the randomly diluted Hopfield model. Assuming that the corresponding system in which the random couplings are replaced by their averages is metastable I will explain how the metastability of the random system is implied with high probability. In particular, I will discuss the tail behaviour of the relevant metastable hitting times of the two systems and the moments of their ratio. This is joint work with A. Bovier, F. Den Hollander, S. Marello and E. Pulvirenti.
15:30
L. Bruneau: Quantum entropic fluctuations and repeated interaction systems
L. Bruneau: Quantum entropic fluctuations and repeated interaction systems
15:30 - 16:30
Since the seminal works of Evans, Searles, Gallavotti and Cohen in the early 90's the study of entropic fluctuations has encountered a fast growing interest in the last decades, and many developments at least in classical systems. Its quantum counterpart however turned out to be very challenging. It has further been realized that the two time measurement protocol, introduced independently by Kurchan and Tasaki in 2000, sheds a new light on the problem. In this talk we will first introduce the problem of entropic fluctuations in quantum systems. In a second part we will concentrate on a specific class of models particularly suited to the problem, the so-called repeated interaction systems whose physical paradigm is the one-atom maser model. This talk is based on a joint work with J.-F. Bougron.