Perturbation theory for ac-driven interfaces in random media

Details Perturbation theory for ac-driven interfaces in random media Perturbation theory for ac-driven interfaces in random media

2009-06-10

arxiv.org/abs/0906.1917v2

Phys. Rev. E, 81, 051128 (2010)

Physics

Condensed Matter

Disordered Systems and Neural Networks

23 pages, substantial changes, replaced with the published version

Scientific paper

10.1103/PhysRevE.81.051128

We study $D$-dimensional elastic manifolds driven by ac-forces in a disordered environment using a perturbation expansion in the disorder strength and the mean-field approximation. We find, that for $D\le 4$ perturbation theory produces non-regular terms that grow unboundedly in time. The origin of these non-regular terms is explained. By using a graphical representation we argue that the perturbation expansion is regular to all orders for $D>4$. Moreover, for the corresponding mean-field problem we prove that ill-behaved diagrams can be resummed in a way, that their unbounded parts mutually cancel. Our analytical results are supported by numerical investigations. Furthermore, we conjecture the scaling of the Fourier coefficients of the mean velocity with the amplitude of the driving force $h$.

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