By Joachim Krug (auth.), Alan McKane, Michel Droz, Jean Vannimenus, Dietrich Wolf (eds.)

The NATO complex examine Institute on "Scale Invariance, Interfaces and Non Equilibrium Dynamics" used to be held on the Isaac Newton Institute for Mathematical Sciences in Cambridge, united kingdom from 20-30 June 1994. the subjects mentioned on the Institute have been all serious about the beginning and nature of complicated buildings came upon faraway from equilibrium. Examples ranged from response diffusion structures and hydrodynamics via to floor progress as a result of deposition. a standard topic was once that of scale invariance end result of the self-similarity of the underly ing constructions. the subjects that have been coated may be widely categorized as trend for mation (theoretical, computational and experimental aspects), the non-equilibrium dynamics of the expansion of interfaces and different manifolds, coarsening phenomena, widely used scale invariance in pushed structures and the idea that of self-organized serious ity. the most characteristic of the Institute used to be the 4 one-hour-Iong lectures given every day by means of invited audio system. as well as thirty-seven of those lectures, contributed lectures have been additionally given. the numerous questions that have been requested after the lectures attested to the buzz and curiosity that the academics succeeded in producing among the scholars. as well as the discussions initiated through lectures, an im portant section of the assembly have been the poster periods, the place contributors have been capable of current their very own paintings, which came about on 3 of the afternoons. The record of titles given on the finish of those lawsuits offers a few suggestion of the variety and scope of those posters.

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**Scale Invariance, Interfaces, and Non-Equilibrium Dynamics**

The NATO complicated learn Institute on "Scale Invariance, Interfaces and Non Equilibrium Dynamics" was once held on the Isaac Newton Institute for Mathematical Sciences in Cambridge, united kingdom from 20-30 June 1994. the subjects mentioned on the Institute have been all serious about the starting place and nature of advanced constructions chanced on faraway from equilibrium.

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Uberlos. Whereas Sun and Plischke claim to identify the strong coupling fixed point in d =2 and derive estimates for the scaling exponents, the analysis of Frey and Tauber indicates a scenario that is similar to the earlier one-loop results 2,62 - only the critical fixed point governing the phase transition is accessible in an expansion around d = 2 dimensions, but the strong coupling regime remains elusive. The non-perturbative nature of this regime suggests that self-consistent modecoupling approaches 109 may be more appropriate than perturbative RG schemes.

In particular, if III < 0 ('uphill' current) the current induces a faceting instabilit~,71,74. 2 Linearized fluctuation theory The theory of kinetic roughening is concerned with the question of how microscopic fluctuations, which are present in virtually any interface displacement process, 28 are transformed, through effective interface equations of the kind derived in the previous section, into large-scale behavior with universal properties. This transformation becomes transparent and easily tractable when the equations of motion are linearized about the flat solution h(x,t) = vot.

We conclude 'Y ~ 2 (model R) 'Y ~ 3 (model A). (65) Next, we observe that the estimates (62) and (63) imply a qualitative change in the screening behavior at an upper critical dimensionality de = 2 for model R, and de = 3 for model A, in the sense that R a "> for d? de. In this high dimensionality regime the random walker effectively averages over many needles before being absorbed, and the two-absorber approximation is clearly inappropriate. Instead, one may attempt a continuum description, in which the lateral structure is ignored and the needle forest is represented by a continuous density function n(h,t).