Higher correlations, universal distributions and finite size scaling in the field theory of depinning

Details Higher correlations, universal distributions and finite size scaling in the field theory of depinning Higher correlations, universal distributions and finite size scaling in the field theory of depinning

2003-01-23

arxiv.org/abs/cond-mat/0301465v1

Phys. Rev. E 68 (2003) 046118

Physics

Condensed Matter

15 pages revtex4. See also preceding article cond-mat/0301464

Scientific paper

10.1103/PhysRevE.68.046118

Recently we constructed a renormalizable field theory up to two loops for the quasi-static depinning of elastic manifolds in a disordered environment. Here we explore further properties of the theory. We show how higher correlation functions of the displacement field can be computed. Drastic simplifications occur, unveiling much simpler diagrammatic rules than anticipated. This is applied to the universal scaled width-distribution. The expansion in d=4-epsilon predicts that the scaled distribution coincides to the lowest orders with the one for a Gaussian theory with propagator G(q)=1/q^(d+2 \zeta), zeta being the roughness exponent. The deviations from this Gaussian result are small and involve higher correlation functions, which are computed here for different boundary conditions. Other universal quantities are defined and evaluated: We perform a general analysis of the stability of the fixed point. We find that the correction-to-scaling exponent is omega=-epsilon and not -epsilon/3 as used in the analysis of some simulations. A more detailed study of the upper critical dimension is given, where the roughness of interfaces grows as a power of a logarithm instead of a pure power.

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