Ising models on power-law random graphs

Details Ising models on power-law random graphs Ising models on power-law random graphs

2010-05-25

arxiv.org/abs/1005.4556v2

Journal of Statistical Physics, 141(4):638-660, (2010)

Mathematics

Probability

Scientific paper

10.1007/s10955-010-0067-9

We study a ferromagnetic Ising model on random graphs with a power-law degree distribution and compute the thermodynamic limit of the pressure when the mean degree is finite (degree exponent $\tau>2$), for which the random graph has a tree-like structure. For this, we adapt and simplify an analysis by Dembo and Montanari, which assumes finite variance degrees ($\tau>3$). We further identify the thermodynamic limits of various physical quantities, such as the magnetization and the internal energy.

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