- Christian Beck (Queen Mary, University of London)
Grassberger Peter (Forschungszentrum Juelich)
We have now institutes for complex systems, conferences on complex systems, and journals of complex systems. So most of us have a good feeling what is a complex system. But what is complexity itself, and is there any way to measure it? The answer to this is surprisingly non-trivial. Indeed, there is no universally agreed concept, according to which a bacterium is more complex than a human. But...
Itamar Procaccia (The Weizmann Institute of Science)
The special challenge of Nonlinear Physics is that every new problem calls for a specialized idea and a new method to solve it. There exist almost no "general" methods in the arsenal. I will review my own forays into the nonlinear domain stressing this challenge and highlighting the few lucky strikes that I had been involved in during more than 35 years of research.
Laura Foini (École Normale Supérieure, Paris)
In Gibbs equilibrium, fluctuation-dissipation relations can be generically used to probe the thermal properties of the system and measure its temperature. When the system under study is integrable, though, the dynamics fails to approach such a Gibbs state, reaching instead a generalized ensemble with a macroscopic number of temperature-like parameters which enforce the value of the...
Edgar Roldan (Max Planck Institute for the Physics of Complex Systems)
The laws of thermodynamics can be extended to mesoscopic systems for which energy changes are on the order of the thermal energy are relevant. Therefore, thermodynamic observables associated with mesoscopic degrees of freedom are stochastic. A key example of such thermodynamic observable is the stochastic entropy production in nonequilibrium processes. Little is known beyond fluctuation...