Anomalous scaling in statistical models of passively advected vector fields

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Abstract

The field theoretic renormalization group and the operator product expansion are applied to the stochastic model of passively advected vector field with the most general form of the nonlinear term allowed by the Galilean symmetry. The advecting turbulent velocity field is governed by the stochastic Navier--Stokes equation. It is shown that the correlation functions of the passive vector field in the inertial range exhibit anomalous scaling behaviour. The corresponding anomalous exponents are determined by the critical dimensions of tensor composite fields (operators) built solely of the passive vector field. They are calculated (including the anisotropic sectors) in the leading order of the expansion in $y$, the exponent entering the correlator of the stirring force in the Navier--Stokes equation (one-loop approximation of the renormalization group). The anomalous exponents exhibit an hierarchy related to the degree of anisotropy: the less is the rank of the tensor operator, the less is its dimension. Thus th
Original languageEnglish
Pages (from-to)851-860
JournalTheoretical and Mathematical Physics
Volume176
Issue number1
DOIs
StatePublished - 2013

Keywords

  • passive vector field
  • turbulent advection
  • anomalous scaling
  • renormalization group
  • operator product expansion

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