Linear and nonlinear response in the aging regime of the one-dimensional trap model
Abstract
We investigate the behavior of the response function in the one-dimensional trap model using scaling arguments that we confirm by numerical simulations. We study the average position of the random walk at time tw+t, given that a small bias h is applied at time tw. Several scaling regimes are found, depending on the relative values of t, tw, and h. Comparison with the diffusive motion in the absence of bias allows us to show that the fluctuation-dissipation relation is valid even in the aging regime, at least for times such that linear response is obeyed. However, for sufficiently long times, the response always becomes nonlinear in h.
- Publication:
-
Physical Review E
- Pub Date:
- June 2003
- DOI:
- 10.1103/PhysRevE.67.065105
- arXiv:
- arXiv:cond-mat/0303582
- Bibcode:
- 2003PhRvE..67f5105B
- Keywords:
-
- 02.50.-r;
- 75.10.Nr;
- 05.20.-y;
- Probability theory stochastic processes and statistics;
- Spin-glass and other random models;
- Classical statistical mechanics;
- Condensed Matter - Disordered Systems and Neural Networks
- E-Print:
- 5 pages, 3 figures, 3 references added