Abstract
Abstract This chapter studies two problems of statistical physics: the ferromagnet and the spin glass, on large random graphs with fixed degree profile. It describes the use of the replica symmetric cavity method in this context, and studies its stability. The analysis relies on physicists methods, without any attempt at being rigorous. It provides a complete solution of the ferromagnetic problem at all temperatures. In the spin glass case, the replica symmetric solution is asymptotically correct in the high temperature ‘paramagnetic’ phase, but it turns out to be wrong in the spin glass phase. The phase transition temperature can be computed exactly.
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