Free energy of disordered urn models in the canonical ensemble

Details Free energy of disordered urn models in the canonical ensemble Free energy of disordered urn models in the canonical ensemble

2007-05-15

arxiv.org/abs/0705.2104v2

J. Phys. Soc. Jpn. 76, 095002 (2007).

Physics

Condensed Matter

Disordered Systems and Neural Networks

5 pages, 1 figure, to appear in J. Phys. Soc. Jpn

Scientific paper

10.1143/JPSJ.76.095002

We calculate the free energy of the disordered urn model using the law of large numbers. It is revealed that the saddle point equation obtained by the usage of the law of large numbers is the same as that obtained by the replica method. Hence, we conclude that the replica symmetric solution is adequate for the disordered urn model. Furthermore, we point out the mathematical similarity of free energies between the urn models and the Random Field Ising Model; this similarity gives an evidence that the replica symmetric solution of the urn models is exact.

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