A new treatment of fluctuation correlations near phase transition points

A general self-consistency approach allows a thorough treatment of the corrections to the standard mean-field approximation (MFA). The natural extension of standard MFA with the help of a cumulant expansion leads to a new point of view on the MF theories. The proposed approach can be used for a systematic treatment of fluctuation effects of various length scales and, perhaps, for the development of a new coarse graining procedure. We outline and justify our method by some preliminary calculations. Concrete results are given for the critical temperature and the Landau parameters of the φ4-theory – the field counterpart of the Ising model. An important unresolved problem of the modern theory of phase transitions – the problem for the calculation of the true critical temperature, is considered within the framework of the present approach.