Derivation of effective field theories

Details Derivation of effective field theories Derivation of effective field theories

2008-08-07

arxiv.org/abs/0808.0937v2

Phys.Rev. E78 (2008) 041122.

Physics

Condensed Matter

Statistical Mechanics

Scientific paper

10.1103/PhysRevE.78.041122

A general self-consistency approach allows a thorough treatment of the corrections to the 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 effective field 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. Results are given for the critical temperature and the Landau parameters of the $\phi^4$-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. A comprehensive description of the ground state properties of many-body systems is also demonstrated.

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