RENORMALIZATION-GROUP IN THE THEORY OF FULLY-DEVELOPED TURBULENCE - THE PROBLEM OF INFRARED-ESSENTIAL CORRECTIONS TO THE NAVIER-STOKES EQUATION

Using the RG approach to the theory of fully developed turbulence, we consider the problem of possible IR-essential corrections to the Navie r-Stokes equation. We formulate an exact criterion for the ''actual IR -essentiality'' of the corrections. In accordance with tills criterion , we check whether certain classes of composite operators are IR-essen tial. All of these operators turn out to be actually IR-inessential fo r arbitrary values of the RG expansion parameter epsilon. This confirm s the absence of the crossover and enables Me RG results obtained Sor asymptotically small values of epsilon to be extrapolated to the physi cal range epsilon > 2.