Home page > Research topics > Dynamical activity and fluctuations far from equilibrium.
Dynamical activity and fluctuations far from equilibrium
MSC : Frédéric van Wijland, Paolo Visco.
Fluctuations in equilibrium systems are described by the fluctuation-dissipation theorem. It relates the response of the systems to an infinitesimal perturbation which drives it out-of-equilibrium to its equilibrium correlations. The proportionality coefficient between response and correlation is the temperature, independently of the perturbation. Analogous relations have been recently put forward for out-of-equilibrium systems. Interestingly, no temperature, nor any other proportionality relationship between correlation and fluctuations has emerged. However, a physical observable called dynamical activity seems to play a central role. This quantity represents a measure of the propensity of the system to move away from its actual microscopic configuration. We are trying to understand how direct measurements (as e.g. in microscopic systems such a living cell) of both the response and the correlations can yield informations about the activity. We are also trying to find out a way of directly measuring the activity, for example in colloidal systems, where it might exhibit signatures of a glassy state.
Nom des membres actuels ou anciens
VAN WIJLAND Frédéric, VISCO Paolo
General keyword
Teams
Keywords
If some information on this page is erroneous or missing (for instance the list of research topics), please contact the web team (lab-msc-web AT listes.sc.univ-paris-diderot.fr).
