Aging dynamics of non-linear elastic interfaces: the Kardar-Parisi-Zhang equation

BUSTINGORRY SEBASTIAN

JOURNAL OF STATISTICAL MECHANICS: THEORY AND EXPERIMENT

IOP and SISSA

Lugar: Trieste, Italia; Año: 2007 vol. 2007 p. 2 - 15

1742-5468

In this work, the out-of-equilibrium dynamics of the Kardar–Parisi–Zhang equation in (1+1) dimensions is studied by means of numerical simulations, focusing on the two-times evolution of an interface in the absence of any disordered environment. This work shows that, even in this simple case, a rich aging behavior develops. A multiplicative aging scenario for the two-times roughness of the system is observed, characterized by the same growth exponent as in the stationary regime. The analysis permits the identification of the relevant growing correlation length, accounting for the important scaling variables in the system. The distribution function of the two-times roughness is also computed and described in terms of a generalized scaling relation. These results are a first-order approximation to the aging properties of the more involved case of a non-linear elastic line in a disordered medium.