Abstract

A version of the renormalization group (renormgroup) method is developed, which is called the method for restoring the uniqueness of temperature. This method is applied to the Malthus-Verhulst equation with a stochastic term. This equation from mathematical biology is reduced to a quantum field problem for the one-dimensional case.

To establish the dependence of the temperature of the stochastic term on the scale of the block-spin variables, the problem is renormalized using the quantum field renormgroup method (the Wilson technique and the minimal subtraction scheme).

As a result of renormalization, the dependence of the temperature of the stochastic term on the scale of the block-spin variables turns out to be the same but ambiguous in both cases.

To resolve this difficulty, a special procedure for restoring the uniqueness of the temperature dependence is developed; this procedure makes it possible to determine the dependence of the stochastic term temperature on the scale of the block-spin variables and calculate the correlation length.

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