# Mean field theories for weakly interacting systems

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Statistical Mechanics
Mean field theories
Mean field theories for weakly interacting systems

Introduction
Weiss mean field theory for the Ising model
Critical exponents of Weiss mean field theory for the Ising model
Hubbard-Stratonovich mean field theory for the Ising model
Variational methods
Bragg-Williams approximation for the Ising model
Bragg-Williams approximation for the Potts model
Mean field theory for the Blume-Emery-Griffiths model
Mean field theories for fluids
Van der Waals equation
Mean field theories for weakly interacting systems
Introduction to Landau theory
Assumptions of the Landau theory
Landau theory for the Ising model
First-order phase transitions in Landau theory
Liquid crystals
Introduction: Ginzburg criterion
Functional partition function and coarse graining
Coarse graining procedure for the Ising model

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