Glauber dynamics for the mean-field Ising model: cut-off, critical power law, and metastability

Details Glauber dynamics for the mean-field Ising model: cut-off, critical power law, and metastability Glauber dynamics for the mean-field Ising model: cut-off, critical power law, and metastability

2007-12-05

arxiv.org/abs/0712.0790v2

Mathematics

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40 pages

Scientific paper

We study the Glauber dynamics for the Ising model on the complete graph, also known as the Curie-Weiss Model. For beta < 1, we prove that the dynamics exhibits a cut-off: the distance to stationarity drops from near 1 to near 0 in a window of order n centered at [2(1-beta)]^{-1} n log n. For beta = 1, we prove that the mixing time is of order n^{3/2}. For beta > 1, we study metastability. In particular, we show that the Glauber dynamics restricted to states of non-negative magnetization has mixing time O(n log n).

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