Documents

DOI

We study the stochastic Kardar-Parisi-Zhang equation for kinetic roughening where the time-independent (columnar or spatially quenched) Gaussian random noise f (t, x) is specified by the pair correlation function 〈 f (t, x) f (t , x )〉 ∝ δ (d) (x − x ), d being the dimension of space. The field-theoretic renormalization group analysis shows that the effect of turbulent motion of the environment (modelled by the coupling with the velocity field described by the Kazantsev-Kraichnan statistical ensemble for an incompressible fluid) gives rise to a new nonlinear term, quadratic in the velocity field. It turns out that this “induced” nonlinearity strongly affects the scaling behaviour in several universality classes (types of long-time, large-scale asymptotic regimes) even when the turbulent advection appears irrelevant in itself. Practical calculation of the critical exponents (that determine the universality classes) is performed to the first order of the double expansion in ε = 4 − d and the velocity exponent ξ (one-loop approximation). As is the case with most “descendants” of the Kardar-Parisi-Zhang model, some relevant fixed points of the renormalization group equations lie in “forbidden zones”, i.e., in those corresponding to negative kinetic coefficients or complex couplings. This persistent phenomenon in stochastic non-equilibrium models requires careful and inventive physical interpretation.

Original languageEnglish
Article number72
Number of pages16
JournalUniverse
Volume8
Issue number2
DOIs
StatePublished - 26 Jan 2022

    Scopus subject areas

  • Physics and Astronomy(all)

    Research areas

  • Critical behaviour, Kinetic roughening, Renormalization group, Turbulence, MULTIFRACTALS, FIELD-THEORY, BEHAVIOR, UPPER CRITICAL DIMENSION, MODEL, turbulence, critical behaviour, RENORMALIZATION-GROUP ANALYSIS, SCALE PROPERTIES, GROWTH, kinetic roughening, OPERATOR PRODUCT EXPANSION, renormalization group, DYNAMIC PHASE-TRANSITIONS

ID: 92115752