Domaines de Recherche: - Physique/Physique/Biophysique
- Science non linéaire/Automates cellulaires et gaz sur réseau
- Science non linéaire/Adaptation et Systèmes auto-organisés
- Sciences du Vivant/Cancer
- Sciences du Vivant/Biologie cellulaire/Organisation et fonctions cellulaires
- Sciences du Vivant/Biochimie, Biologie Moléculaire/Réseaux moléculaires
- Physique/Physique/Physique et Société
- Physique/Matière Condensée/Science des matériaux
- Physique/Matière Condensée/Autre
- Physique/Matière Condensée/Mécanique statistique
- Physique/Matière Condensée/Matière Molle
- Physique/Matière Condensée/Systèmes désordonnés et réseaux de neurones
- Science non linéaire/Dynamique Chaotique
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Quelques études théoriques de dynamique vitreuse: polymères, gels et modèles stochastiques
Auteur(s): Pitard E.
(H.D.R.)
, 2010-09-28
Résumé: (à compléter)
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Dernieres productions scientifiques :
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Transport on a lattice with dynamical defects 
Auteur(s): Turci F., PARMEGGIANI A., PITARD E., Romano M. carmen, Ciandrini Luca
(Article) Publié:
Physical Review E: Statistical, Nonlinear, and Soft Matter Physics, vol. 87 p.012705 (2013)
Ref HAL: hal-00816492_v1
DOI: 10.1103/PhysRevE.87.012705
Résumé: Many transport processes in nature take place on substrates, often considered as unidimensional lanes. These unidimensional substrates are typically nonstatic: Affected by a fluctuating environment, they can undergo conformational changes. This is particularly true in biological cells, where the state of the substrate is often coupled to the active motion of macromolecular complexes, such as motor proteins on microtubules or ribosomes on mRNAs, causing new interesting phenomena. Inspired by biological processes such as protein synthesis by ribosomes and motor protein transport, we introduce the concept of localized dynamical sites coupled to a driven lattice gas dynamics. We investigate the phenomenology of transport in the presence of dynamical defects and find a regime characterized by an intermittent current and subject to severe finite-size effects. Our results demonstrate the impact of the regulatory role of the dynamical defects in transport not only in biology but also in more general contexts. DOI: 10.1103/PhysRevE.87.012705
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Dynamic transition in an atomic glass former: A molecular-dynamics evidence
Auteur(s): PITARD E., Lecomte V., van Wijland F.
(Article) Publié:
EPL, vol. 96 p.56002 (2011)
Ref HAL: hal-00704326_v1
DOI: 10.1209/0295-5075/96/56002
Résumé: We find that a Lennard-Jones mixture displays a dynamic phase transition between an active regime and an inactive one. By means of molecular dynamics simulations and of a finite-size study, we show that the spacetime dynamics in the supercooled regime coincides with a dynamic first-order transition point. Copyright (C) EPLA, 2011
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The evolution of wealth transmission in human populations: a modeling approach
Auteur(s): Pitard E.
Conférence invité: Biophysics Program = Populations, Evolution and Physics (Aspen, US, 2010-01-04)
Résumé: (en cours)
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Thermodynamics of histories for models of glassy dynamics
Auteur(s): Pitard E.
Conférence invité: Many-body systems for from equilibrium: fluctuations, show dynamics and long-range interactions (Dresden, DE, 2009-02-16)
Résumé: (en cours)
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First-order dynamical phase transition in models of glasses: an approach based on ensembles of histories
Auteur(s): Garrahan J. P., Jack R. L., Lecomte V., Pitard E., Van Duijvendijk K., Van Wijland F.
(Article) Publié:
Journal of Physics A: Mathematical and Theoretical, vol. 42 p.075007 (2009)
Ref HAL: hal-00364938_v1
Ref Arxiv: 0810.5298
DOI: 10.1088/1751-8113/42/7/075007
Résumé: We investigate the dynamics of kinetically constrained models of glassformers by analysing the statistics of trajectories of the dynamics, orhistories, using large deviation function methods. We show that, in general,these models exhibit a first-order dynamical transition between active andinactive dynamical phases. We argue that the dynamical heterogeneitiesdisplayed by these systems are a manifestation of dynamical first-order phasecoexistence. In particular, we calculate dynamical large deviation functions,both analytically and numerically, for the Fredrickson-Andersen model, the Eastmodel, and constrained lattice gas models. We also show how large deviationfunctions can be obtained from a Landau-like theory for dynamical fluctuations.We discuss possibilities for similar dynamical phase-coexistence behaviour inother systems with heterogeneous dynamics.
Commentaires: 29 pages, 7 figs,
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