Origin of the violation of the fluctuation–dissipation theorem in systems with activated dynamics

A. Pérez-Madrid, D. Reguera and Rubı́, J.M.

Physica A: Statistical Mechanics and its Applications, 2003, vol. 329, issue 3, 357-364

Abstract: We analyze the validity of the fluctuation–dissipation theorem for slow relaxation systems in the context of mesoscopic nonequilibrium thermodynamics. We demonstrate that the violation arises as a natural consequence of the elimination of fast variables in the description of a glassy system, and it is intrinsically related to the underlying activated nature of slow relaxation. In addition, we show that the concept of effective temperature, introduced to characterize the magnitude of the violation, is not robust since it is observable-dependent, can diverge, or even be negative.

Keywords: Fluctuation–dissipation theorem; Effective temperatures; Slow relaxation; Glassy systems; Mesoscopic nonequilibrium thermodynamics (search for similar items in EconPapers)
Date: 2003
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:329:y:2003:i:3:p:357-364

DOI: 10.1016/S0378-4371(03)00634-4

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