Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2011-10-27
Journal of Statistical Physics 115, 395-413, 2004
Physics
Condensed Matter
Statistical Mechanics
Scientific paper
We consider finite range Gibbs fields and provide a purely combinatorial proof of the exponential tree decay of semi--invariants, supposing that the logarithm of the partition function can be expressed as a sum of suitable local functions of the boundary conditions. This hypothesis holds for completely analytical Gibbs fields; in this context the tree decay of semi--invariants has been proven via analyticity arguments. However the combinatorial proof given here can be applied also to the more complicated case of disordered systems in the so called Griffiths' phase when analyticity arguments fail.
Bertini Lorenzo
Cirillo Emilio N. M.
Olivieri Emiliano
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