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Displaying 541 – 560 of 1377

Hypoelliptic estimates for some linear diffusive kinetic equations

Frédéric Hérau (2010)

Journées Équations aux dérivées partielles

This note is an announcement of a forthcoming paper [13] in collaboration with K. Pravda-Starov on global hypoelliptic estimates for Fokker-Planck and linear Landau-type operators. Linear Landau-type equations are a class of inhomogeneous kinetic equations with anisotropic diffusion whose study is motivated by the linearization of the Landau equation near the Maxwellian distribution. By introducing a microlocal method by multiplier which can be adapted to various hypoelliptic kinetic equations,...

Identification of a localized source in an interstellar cloud: an inverse problem

Meri Lisi, Silvia Totaro (2005)

Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti Lincei. Matematica e Applicazioni

We study an inverse problem for photon transport in an interstellar cloud. In particular, we evaluate the position $x_{0}$ of a localized source $q (x) = q_{0} δ (x - x_{0})$ , inside a nebula (for example, a star). We assume that the photon transport phenomenon is one-dimensional. Since a nebula moves slowly in time, the number of photons $U$ inside the cloud changes slowly in time. For this reason, we consider the so-called quasi-static approximation $u$ to the exact solution $U$ . By using semigroup theory, we prove existence and uniqueness...

Il sesto problema di Hilbert e le moderne teorie cinetiche.

Mario Pulvirenti (2004)

Bollettino dell'Unione Matematica Italiana

In questo contributo si discute qualche problema connesso alla derivazione delle equazioni cinetiche a partire dalla meccanica dei sistemi di particelle.

Il teorema del trasporto per un'interfaccia in moto attraverso una regione di controllo

Alessandro Tiero (1994)

Rendiconti del Seminario Matematico della Università di Padova

Image sampling with quasicrystals.

Grundland, Mark, Patera, Jirí, Masáková, Zuzana, Dodgson, Neil A. (2009)

SIGMA. Symmetry, Integrability and Geometry: Methods and Applications [electronic only]

Improved upper bounds for self-avoiding walks in $ℤ^{d}$ .

Pönitz, André, Tittmann, Peter (2000)

The Electronic Journal of Combinatorics [electronic only]

Impurities in the Heisenberg magnet and the general recipe of Weyl.

Lulek, B. (1991)

Séminaire Lotharingien de Combinatoire [electronic only]

Increasing propagation of chaos for mean field models

G. Ben Arous, O. Zeitouni (1999)

Annales de l'I.H.P. Probabilités et statistiques

Individual-based lattice model for spatial spread of epidemics.

Fukś, Henryk, Lawniczak, Anna T. (2001)

Discrete Dynamics in Nature and Society

Inégalités de corrélation sur ${- 1, 1}^{n}$ et dans $ℝ^{n}$

Étienne Laroche (1993)

Annales de l'I.H.P. Probabilités et statistiques

Inequalities for single crystal ribbon growth by edge-defined film-fed growth technique.

Balint, Stefan, Balint, Agneta M. (2008)

Journal of Inequalities and Applications [electronic only]

Inequalities for single crystal tube growth by edge-defined film-fed growth technique.

Balint, Stefan, Balint, Agneta M. (2009)

Journal of Inequalities and Applications [electronic only]

Inequality of two critical probabilities for percolation.

Kahn, Jeff (2003)

Electronic Communications in Probability [electronic only]

Infinite classes of simple and multiple antisymmetry four-dimensional point groups.

Jablan, Slavik V. (1992)

Publications de l'Institut Mathématique. Nouvelle Série

Infinite queueing systems with tree structure

Lucie Fajfrová (2006)

Kybernetika

We focus on invariant measures of an interacting particle system in the case when the set of sites, on which the particles move, has a structure different from the usually considered set $ℤ^{d}$ . We have chosen the tree structure with the dynamics that leads to one of the classical particle systems, called the zero range process. The zero range process with the constant speed function corresponds to an infinite system of queues and the arrangement of servers in the tree structure is natural in a number...

Infinite volume asymptotics of the ground state energy in a scaled poissonian potential

Franz Merkl, Mario V. Wüthrich (2002)

Annales de l'I.H.P. Probabilités et statistiques

Infrared analysis of the tridimensional Gross-Neveu model: pointwise bounds for the effective potential

Aldo Procacci, Emmanuel Pereira (1999)

Annales de l'I.H.P. Physique théorique

Integral Quadratic Forms, Kac-Moody Algebras, and Fractional Quantum Hall Effect. An ADE- $𝒪$ Classification

Jürg Fröhlich, Emmanuel Thiran (1993)

Recherche Coopérative sur Programme n°25

Integrals of Motion of Classical Lattice Sine-Gordon System

B. Enriquez, B. L. Feigin (1995)

Recherche Coopérative sur Programme n°25

Interacting brownian particles and Gibbs fields on pathspaces

David Dereudre (2003)

ESAIM: Probability and Statistics

In this paper, we prove that the laws of interacting brownian particles are characterized as Gibbs fields on pathspace associated to an explicit class of hamiltonian functionals. More generally, we show that a large class of Gibbs fields on pathspace corresponds to brownian diffusions. Some applications to time reversal in the stationary and non stationary case are presented.

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