Nicolas B. Garnier
Chargé de Recherche, CNRS
- In fluid Turbulence: in collaboration with Stéphane Roux, and Carlos Granero-Belichon, we propose a new perspective on Turbulence, using the entropy rate from Information Theory. An arXiv preprint is available (accepted in EuroPhysics Letters).
- In Neurosciences: in collaboration with Stéphane Roux, Nicolas Fourcaud-Trocmé and Nathalie Buonviso's team. Work in progress...
- How globally coupled Stuart-Landau oscillators do synchronize? In collaboration with Chaoqing Wang, we studied how adding a new freedom degree to oscillators (considering also the radius instead of the phase alone as in the Kuramoto model) can lead to a sub-critical transition to synchronization.
An arXiv preprint is available.
Modeling the uterus
- arXiv preprint reporting the effect of increased coupling between cells over maturation of the uterus.
This work in collaboration with Jinshan Xu, Alain Pumir, Rajeev Singh and Sitabhra Sinha has been published in Phys. Rev. Lett., and has received some advertisement : in APS Physics and in Physics World.
- arXiv preprint reporting multistability in a system of coupled Fitzhugh-Nagumo equations. This application of statistical physics may be of interest to the study and description of biological systems like the uterus.
- arXiv preprint studying the role of cellular coupling in the spontaneous generation of electrical activity in uterine tissue. This work presents a physiological model involving more than 20 variables, and more than 120 parameters.
This work in collaboration with Jinshan Xu, Alain Pumir, Rajeev Singh, Shakti N. Menon and Sitabhra Sinha has been published in PloS One.
Collective Free Improvisation (model and experiments)
- With Clément Canonne, we proposed a model for collective free improvisation,
using complex systems to describe the organisation of an improvisation piece in coherent and non-coherent sequences.
- We also performed experiments (recording Collective Free Improvisations under some specific protocol) in order to decipher the relations between individual decisions taken by the musicians and the global structure of the musical piece.
This work has been published in Journal of New Music Research.
Fluctuations in systems out of (or even far from) equilibrium.
An introduction to this topic (pdf slides) that I gave at the
meeting on November 30th 2006.
- Experimental measurements of the fluctuations of the work W given to
and the heat Q dissipated by an harmonic oscillator in contact with a thermostat,
together with an analytical derivation of the the probability density function of W and Q.
Fluctuation Theorems for those two quantities are studied :
- arXiv preprint for the work W (letter).
- arXiv preprint for the heat Q (letter).
- arXiv preprint of a full report on fluctuations of W and Q,
with a formulation of the first principle, the study of transient evolutions and steady
states (with a linear or sinusoidal time-prescription of the driving), and the definition
of the distance from equilibrium.
- arXiv preprint Fluctuations in a resistor :
Fluctuation Dissipation Theorem (FDT) and Fluctuation Theorems (FT) for work and heat
have been tested on a model electrical system.
- arXiv preprint presenting a novel
method (from Pierre Gaspard)
to measure entropy production from time series, and how this has been exploited on our experimental data.
- arXiv preprint presenting experimental measurements
of extreme fluctuations of large negative amplitude in two turbulent flows, and how those
fluctuations verify the Fluctuation Theorem.
- arXiv preprint reporting a measure of effective temperature of Turbulence, with Antoine Naert.
Last update: September 26th, 2016,