Negative fluctuation-dissipation ratios in the backgammon model

Details Negative fluctuation-dissipation ratios in the backgammon model Negative fluctuation-dissipation ratios in the backgammon model

2009-04-16

arxiv.org/abs/0904.2520v1

PRE Vol.79, 041122 (2009)

Physics

Condensed Matter

Statistical Mechanics

32 pages, 10 figures. Accepted in PRE

Scientific paper

We analyze fluctuation-dissipation relations in the Backgammon model: a system that displays glassy behavior at zero temperature due to the existence of entropy barriers. We study local and global fluctuation relations for the different observables in the model. For the case of a global perturbation we find a unique negative fluctuation-dissipation ratio that is independent of the observable and which diverges linearly with the waiting time. This result suggests that a negative effective temperature can be observed in glassy systems even in the absence of thermally activated processes.

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