A remark on monotonicity for the Glauber dynamics on finite graphs. (English) Zbl 1192.82050

Properties of the spectral gap in the trasition matrix of the Glauber dynamics are investigated, with a focus on a monotonicity hypothesis. Its general validity is still an open problem. It is known that the gap may be monotone decreasing in each coupling constant of the Hamiltonian, for cycles of any length. The present author departs from correlation inequalities (GKS and GHZ) for spin systems to verify whether the single spin expectation for a fixed time in the relaxation process starting from all-up configuration is monotone increasing in each coupling constant. If that would hold true the monotonicity of the spectral gap would follow. The answer is negative (counter example).


82C20 Dynamic lattice systems (kinetic Ising, etc.) and systems on graphs in time-dependent statistical mechanics
60K35 Interacting random processes; statistical mechanics type models; percolation theory
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