Physics – Mathematical Physics
Scientific paper
2007-07-17
Physics
Mathematical Physics
25 pages
Scientific paper
We consider tiles of some fixed size, with an associated weighting on the shapes of tile, of total mass 1. We study the pressure, $p$, of tilings with those tiles; the pressure, one over the volume times the logarithm of the partition function. (The quantity we define as "pressure" could, perhaps equally harmoniously with physics notation, be called "entropy per volume", neither nomenclature is "correct".) We let $\hat p^0$ (easy to compute) be the pressure in the limit of absolute smoothness (the weighting function is constant). Then as smoothness, suitably defined, increases, $p$ converges to $\hat p^0$, uniformly in the volume. It is the uniformity requirement that makes the result non-trivial. This seems like a very basic result in the theory of pressure of tilings. Though at the same time, perhaps non-glamorous, being bereft of geometry and not very difficult. The problem arose for us out of study of a problem in mathematical physics, associated to a model of ferromagnetism.
Federbush Paul
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