Jean-Pierre Eckmann, Emmanuel Zabey
Strange Heat Flux in (An)Harmonic Networks
(244K, postscript)

ABSTRACT.  We study the heat transport in systems of coupled oscillators driven 
out of equilibrium by Gaussian heat baths. 
We illustrate with a few examples that such systems can exhibit 
``strange'' transport phenomena. In particular, {\em circulation} of heat flux 
may appear in the steady state of a system of three oscillators only. 
This indicates that the direction of the heat fluxes can 
in general not be ``guessed" from the temperatures of the heat baths. 
Although we primarily consider 
harmonic couplings between the oscillators, we explain why this 
strange behavior persists under weak anharmonic perturbations.