WorldCat Identities

Olla, Stefano 1959-

Overview
Works: 11 works in 42 publications in 2 languages and 1,151 library holdings
Genres: Conference papers and proceedings 
Roles: Editor, Thesis advisor, Author
Classifications: QC175.2, 530.138
Publication Timeline
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Most widely held works by Stefano Olla
Entropy methods for the Boltzmann equation : lectures from a special semester at the Centre Émile Borel, Institut H. Poincaré, Paris, 2001 by Fraydoun Rezakhanlou( Book )

17 editions published in 2008 in English and held by 227 WorldCat member libraries worldwide

Entropy and entropy production have recently become mathematical tools for kinetic and hydrodynamic limits, when deriving the macroscopic behaviour of systems from the interaction dynamics of their many microscopic elementary constituents at the atomic or molecular level. During a special semester on Hydrodynamic Limits at the Centre ∞[beta]mile Borel in Paris, 2001 two of the research courses were held by C. Villani and F. Rezakhanlou. Both illustrate the major role of entropy and entropy production in a mutual and complementary manner and have been written up and updated for joint publication. Villani describes the mathematical theory of convergence to equilibrium for the Boltzmann equation and its relation to various problems and fields, including information theory, logarithmic Sobolev inequalities and fluid mechanics. Rezakhanlou discusses four conjectures for the kinetic behaviour of the hard sphere models and formulates four stochastic variations of this model, also reviewing known results for these
Fluctuations à l'équilibre d'un modèle stochastique non gradient qui conserve l'énergie by Freddy Hernandez( Book )

1 edition published in 2010 in English and held by 1 WorldCat member library worldwide

In this thesis we study the equilibrium energy fluctuation field of a one-dimensional reversible non gradient model. We prove that the limit fluctuation process is governed by a generalized Ornstein-Uhlenbeck process. By adapting the non gradient method introduced by S.R.S Varadhan, we identify the correct diffusion term, which allows us to derive the Boltzmann-Gibbs principle. This is the key point to show that the energy fluctuation field converges in the sense of finite dimensional distributions to a generalized Ornstein-Uhlenbeck process. Moreover, using again the Boltzmann-Gibbs principle we also prove tightness for the energy fluctuation field in a specified Sobolev space, which together with the finite dimensional convergence implies the convergence in distribution to the generalized Ornstein-Uhlenbeck process mentioned above. The fact that the conserved quantity is not a linear functional of the coordinates of the system, introduces new difficulties of geometric nature in applying Varadhan's non gradient method
Fluctuations à l'équilibre d'un modèle stochastique non gradient qui conserve l'énergie by Freddy Hernandez( )

1 edition published in 2010 in English and held by 1 WorldCat member library worldwide

In this thesis we study the equilibrium energy fluctuation field of a one-dimensional reversible non gradient model. We prove that the limit fluctuation process is governed by a generalized Ornstein-Uhlenbeck process. By adapting the non gradient method introduced by S.R.S Varadhan, we identify the correct diffusion term, which allows us to derive the Boltzmann-Gibbs principle. This is the key point to show that the energy fluctuation field converges in the sense of finite dimensional distributions to a generalized Ornstein-Uhlenbeck process. Moreover, using again the Boltzmann-Gibbs principle we also prove tightness for the energy fluctuation field in a specified Sobolev space, which together with the finite dimensional convergence implies the convergence in distribution to the generalized Ornstein-Uhlenbeck process mentioned above. The fact that the conserved quantity is not a linear functional of the coordinates of the system, introduces new difficulties of geometric nature in applying Varadhan's non gradient method
Milieux aléatoires by Josselin Garnier( Book )

1 edition published in 2001 in French and held by 1 WorldCat member library worldwide

Limites hydrodynamiques et fluctuations à l'équilibre pour des systèmes de particules en interaction by K. L Nagy( Book )

1 edition published in 2006 in French and held by 1 WorldCat member library worldwide

This thesis concerns three different models of interacting particle systems. In the first part of the thesis we give an elementary proof of the central limit theorem for one dimensional symmetric random walk in random environment and we derive the hydrodynamic limit of the symmetric simple exclusion in random environment. In the second part we investigate a hyperbolic and non-attractive lattice-gas model. By means of the method of compensated compactness, logarithmic Sobolev inequalities and the Lax entropy inequality we prove existence and uniqueness of the hydrodynamic limit even in the regime of shocks. In the third part of the thesis we consider a system of harmonic oscillators with multiplicative noise. We show that the equilibrium fluctuations of the conserved fields (energy and deformation) at a diffusive scaling are described by a couple of generalized Ornstein-Uhlenbeck processes
Problèmes de diffusion pour des chaînes d'oscillateurs harmoniques perturbées by Marielle Simon( )

1 edition published in 2014 in English and held by 1 WorldCat member library worldwide

The heat equation is known to be a macroscopic phenomenon, emerging after a diffusive rescaling of space and time. In linear systems of interacting oscillators, the energy ballistically disperses and the thermal conductivity is infinite. Since the Fourier law is not valid for linear interactions, non-linearities in the microscopic dynamics are needed. In order to bring ergodicity to the system, we superpose a stochastic energy conserving perturbation to the underlying deterministic dynamics.In the first part we study the Hamiltonian dynamics of linear coupled oscillators, which are perturbed by a degenerate conservative stochastic noise. The latter flips the sign of the velocities at random times. The evolution yields two conservation laws (the energy and the length of the chain), and the macroscopic behavior is given by a non-linear parabolic system.Then, we suppose the harmonic oscillators to evolve in a random environment, in addition to be stochastically perturbed. The noise is very degenerate, and we prove a macroscopic behavior that holds at equilibrium: precisely, energy fluctuations at equilibrium evolve according to an infinite dimensional Ornstein-Uhlenbeck process driven by the linearized heat equation.Finally, anomalous behaviors have been observed for one-dimensional systems which preserve momentum in addition to the energy. In the third part, we consider two different perturbations, the first one preserving the momentum, and the second one destroying that new conservation law. When the intensity of the second noise is decreasing, we observe (in a suitable time scale) a phase transition between a regime of normal diffusion and a regime of super-diffusion
Large deviation problems in statistical mechanics by Stefano Olla( )

1 edition published in 1987 in English and held by 1 WorldCat member library worldwide

Diffusion et fluctuations dans des systèmes conservatifs by Cédric Bernardin( Book )

1 edition published in 2004 in French and held by 1 WorldCat member library worldwide

La thèse se compose de deux parties distinctes et traite de systèmes de particules en interaction. Dans la première partie, nous avons développé les méthodes de dualité généralisée dans trois contextes : régularité d'un coefficient de diffusion, temps d'occupation d'un site dans le processus d'exclusion et fluctuations dans les dynamiques de awasaki. Dans la deuxième partie, nous introduisons un modèle de conduction de la chaleur et étudions le comportement hydrodynamique du système en admettant une conjecture que nous avons pu démontrer dans un cas simple
Homogénéisation de processus de diffusion en milieu aléatoire by Gaël Benabou( Book )

1 edition published in 2005 in French and held by 1 WorldCat member library worldwide

Cette thèse étudie l'homogénéisation du processus d'Ornstein-Uhlenbeck dans un milieu aléatoire. Ce processus modélise le mouvement microscopique d'une particule de masse non nulle dans un fluide. On prouvera un théorème central limit pour la trajectoire d'une particule marqée soumise à un potentiel non borné. On montrera également le comportement superdiffusif de la particule dans un champ de vitesses incompressible turbulent et stratifié. Nous ferons des comparaisons avec le cas d'une particule de masse nulle
A microscopic model of heat conduction by Giada Basile( Book )

1 edition published in 2007 in English and held by 1 WorldCat member library worldwide

 
Audience Level
0
Audience Level
1
  Kids General Special  
Audience level: 0.58 (from 0.57 for Entropy me ... to 0.96 for Problèmes ...)

Entropy methods for the Boltzmann equation : lectures from a special semester at the Centre Émile Borel, Institut H. Poincaré, Paris, 2001
Languages
English (22)

French (4)

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