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arxiv: 0902.0294 · v1 · pith:TWEPEWKMnew · submitted 2009-02-02 · 🧮 math-ph · cond-mat.dis-nn· math.MP· math.PR

On Small Perturbations of a Spin Glass System

classification 🧮 math-ph cond-mat.dis-nnmath.MPmath.PR
keywords perturbationsglassspinsystemalterbehaviorcannotcompletely
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We show through a simple example that perturbations of the Hamiltonian of a spin glass which cannot be detected at the level of the free energy can completely alter the behavior of the overlap. In particular, perturbations of order O(log N), with N the size of the system, suffice to have ultrametricity emerge in the thermodynamical limit.

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