Slow decorrelations in KPZ growth

Details Slow decorrelations in KPZ growth Slow decorrelations in KPZ growth

2008-06-08

arxiv.org/abs/0806.1350v2

J. Stat. Mech. (2008), P07022

Physics

Mathematical Physics

22 pages, 9 figures, LaTeX; Minor language revisions

Scientific paper

10.1088/1742-5468/2008/07/P07022

For stochastic growth models in the Kardar-Parisi-Zhang (KPZ) class in 1+1 dimensions, fluctuations grow as t^{1/3} during time t and the correlation length at a fixed time scales as t^{2/3}. In this note we discuss the scale of time correlations. For a representant of the KPZ class, the polynuclear growth model, we show that the space-time is non-trivially fibred, having slow directions with decorrelation exponent equal to 1 instead of the usual 2/3. These directions are the characteristic curves of the PDE associated to the surface's slope. As a consequence, previously proven results for space-like paths will hold in the whole space-time except along the slow curves.

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