### Free energy according to Poincare' and Landau

Gaeta, G *(Universita' di Milano)*

Friday 11 January 2013, 10:20-11:00

Seminar Room 1, Newton Institute

#### Abstract

In the Landau theory of phase transitions one considers an effective potential U whose symmetry group G and degree d depend on the system under consideration; generally speaking, U is the most general G-invariant polynomial of degree d. When such a U turns out to be too complicate for a direct analysis, it is essential to be able to drop unessential terms, i.e., to apply a simplifying criterion. Criteria based on singularity theory exist and have a rigorous foundation, but are often very difficult to apply in practice. Here we consider a simplifying criterion and rigorously justify it on the basis of classical Lie-Poincare theory; this builds on (and justifies) a proposal by Gufan.

#### Presentation

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