Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2009-04-16
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.
Garriga Adan
Pagonabarraga Ignacio
Ritort Felix
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