Energy flow, partial equilibration and effective temperatures in systems with slow dynamics

Details Energy flow, partial equilibration and effective temperatures in systems with slow dynamics Energy flow, partial equilibration and effective temperatures in systems with slow dynamics

1996-11-06

arxiv.org/abs/cond-mat/9611044v1

Phys. Rev. E 55, 3898 (1997)

Physics

Condensed Matter

Disordered Systems and Neural Networks

34 pages, 10 figures, LaTeX, REVTeX

Scientific paper

10.1103/PhysRevE.55.3898

We show that, in nonequilibrium systems with small heat flows, there is a time-scale dependent effective temperature which plays the same role as the thermodynamical temperature, in that it controls the direction of heat flows and acts as a criterion for thermalization. We simultaneously treat the case of stationary systems with weak stirring and of glassy systems that age after cooling and show that they exhibit very similar behavior provided that time dependences are expressed in terms of the correlations of the system. We substantiate our claims with examples taken from solvable models with non-trivial low-temperature dynamics, but argue that they have a much wider range of validity. We suggest experimental checks of these ideas.

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