Fluctuation-dissipation relation and the Edwards entropy for a glassy granular compaction model

Details Fluctuation-dissipation relation and the Edwards entropy for a glassy granular compaction model Fluctuation-dissipation relation and the Edwards entropy for a glassy granular compaction model

2004-04-05

arxiv.org/abs/cond-mat/0404111v2

Phys. Rev. E 71, 065102 (2005)

Physics

Condensed Matter

Statistical Mechanics

4 pages, 3 figures

Scientific paper

10.1103/PhysRevE.71.065102

We analytically study a one dimensional compaction model in the glassy regime. Both correlation and response functions are calculated exactly in the evolving dense and low tapping strength limit, where the density relaxes in a $1/\ln t$ fashion. The response and correlation functions turn out to be connected through a non-equilibrium generalisation of the fluctuation-dissipation theorem. The initial response in the average density to an increase in the tapping strength is shown to be negative, while on longer timescales it is shown to be positive. On short time scales the fluctuation-dissipation theorem governs the relation between correlation and response, and we show that such a relationship also exists for the slow degrees of freedom, albeit with a different temperature. The model is further studied within the statistical theory proposed by Edwards and co-workers, and the Edwards entropy is calculated in the large system limit. The fluctuations described by this approach turn out to match the fluctuations as calculated through the dynamical consideration. We believe this to be the first time these ideas have been analytically confirmed in a non-mean-field model.

Affiliated with

Also associated with

No associations

Rating

Fluctuation-dissipation relation and the Edwards entropy for a glassy granular compaction model does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Fluctuation-dissipation relation and the Edwards entropy for a glassy granular compaction model, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fluctuation-dissipation relation and the Edwards entropy for a glassy granular compaction model will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-666607