Strict convexity of the free energy for non-convex gradient models at moderate $β$

Details Strict convexity of the free energy for non-convex gradient models at moderate $β$ Strict convexity of the free energy for non-convex gradient models at moderate $β$

2008-01-08

arxiv.org/abs/0801.1308v1

Physics

Mathematical Physics

17 pages, 2 figures

Scientific paper

We consider a gradient interface model on the lattice with interaction potential which is a non-convex perturbation of a convex potential. We show using a one-step multiple scale analysis the strict convexity of the surface tension at high temperature. This is an extension of Funaki and Spohn's result, where the strict convexity of potential was crucial in their proof that for every tilt there is a unique, shift invariant, ergodic Gibbs measure for the $\nabla\phi$ field.

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