### The thermostated dynamical systems approach to nonequilibrium steady states

Klages, R *(Queen Mary University of London)*

Thursday 07 November 2013, 10:00-11:00

Seminar Room 1, Newton Institute

#### Abstract

In this talk I will outline a theory that aims at understanding the emergence of irreversible
macroscopic transport starting from reversible microscopic dynamics. At the heart of this
approach is to suitably model the interaction of a subsystem with a thermal reservoir. A simple example is a tracer particle in a fluid exhibiting Brownian motion for which there is the well-known description in terms of stochastic Langevin dynamics. Three decades ago scientists proposed a fully deterministic, time reversible modeling of thermalized motion by deriving a generalized Hamiltonian formalism yielding generalized friction coefficients in terms what is called Gaussian and Nos´e-Hoover thermostats. Surprisingly, in nonequilibrium situations such as, e.g., under an external electric field, this time reversible dissipative dynamics generates fractal attractors, exhibits an identity between phase space contraction and entropy production, and furnishes formulas that express transport coefficients in terms of Lyapunov exponents. In my talk I will show how this class of dynamical systems is constructed, will review its basic dynamical systems
properties, and will critically discuss a conjectured universality of these properties. I will present a rather general summary of this approach, not much pre-knowledge about this particular field of research is required.
[1] R.Klages, Microscopic Chaos, Fractals and Transport in Nonequilibrium Statistical Mechanics (World Scientific, Singapore, 2007)

#### Presentation

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