Large random correlations in individual mean field spin glass samples

Details Large random correlations in individual mean field spin glass samples Large random correlations in individual mean field spin glass samples

2010-10-15

arxiv.org/abs/1010.3237v2

J. Stat. Mech. (2011) P02009

Physics

Condensed Matter

Disordered Systems and Neural Networks

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Scientific paper

10.1088/1742-5468/2011/02/P02009

We argue that complex systems must possess long range correlations and illustrate this idea on the example of the mean field spin glass model. Defined on the complete graph, this model has no genuine concept of distance, but the long range character of correlations is translated into a broad distribution of the spin-spin correlation coefficients for almost all realizations of the random couplings. When we sample the whole phase space we find that this distribution is so broad indeed that at low temperatures it essentially becomes uniform, with all possible correlation values appearing with the same probability. The distribution of correlations inside a single phase space valley is also studied and found to be much narrower.

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