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Effective ergodicity in single-spin-flip dynamics
Statistical Mechanics · Submitted 18 May 2014
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim Results show that caution should be taken when using the TM metric at system parameters that give rise to strong correlations.
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The abstract, sentence by sentence
A quantitative measure of convergence to effective ergodicity, the Thirumalai-Mountain (TM) metric, is applied to Metropolis and Glauber single-spin-flip dynamics. In computing this measure, finite lattice ensemble averages are obtained using the exact solution for a one dimensional Ising model, whereas the time averages are computed with Monte Carlo simulations. The time evolution of the effective ergodic convergence of Ising magnetization is monitored. By this approach, diffusion regimes of the effective ergodic convergence of magnetization are identified for different lattice sizes, nonzero temperature, and nonzero external field values. Results show that caution should be taken when using the TM metric at system parameters that give rise to strong correlations.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | A quantitative measure of convergence to effective ergodicity, the Thirumalai-Mountain (TM) metric, is applied to Metropolis and Glauber single-spin-flip dynamics. | contribution 0.63 | 0.86 | 0.07 | asserted 0.99 |
| s1 | In computing this measure, finite lattice ensemble averages are obtained using the exact solution for a one dimensional Ising model, whereas the time averages are computed with Monte Carlo simulations. | method 1.00 | 0.89 | 0.03 | asserted 1.00 |
| s2 | The time evolution of the effective ergodic convergence of Ising magnetization is monitored. | method 0.54 | 0.90 | 0.03 | asserted 0.97 |
| s3 | By this approach, diffusion regimes of the effective ergodic convergence of magnetization are identified for different lattice sizes, nonzero temperature, and nonzero external field values. | result 0.81 | 0.91 | 0.13 | asserted 1.00 |
| s4 | Results show that caution should be taken when using the TM metric at system parameters that give rise to strong correlations. | interpretation 0.63 | 0.87 | 0.75 | asserted 0.87 |
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Original abstract
A quantitative measure of convergence to effective ergodicity, the Thirumalai-Mountain (TM) metric, is applied to Metropolis and Glauber single-spin-flip dynamics. In computing this measure, finite lattice ensemble averages are obtained using the exact solution for a one dimensional Ising model, whereas the time averages are computed with Monte Carlo simulations. The time evolution of the effective ergodic convergence of Ising magnetization is monitored. By this approach, diffusion regimes of the effective ergodic convergence of magnetization are identified for different lattice sizes, nonzero temperature, and nonzero external field values. Results show that caution should be taken when using the TM metric at system parameters that give rise to strong correlations.
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As a further constraint on measuring ergodicity, we consider the convergence of the TM metric towards ergodicity, following the relation proposed in [ref] and fitting the convergence in a manner that has been applied to various systems exhibiting both ergodic and non-ergodic behaviours [ref] .
Ergodicity of FIRE: star formation variations within and between simulated galaxies · TM Metric Convergence · 0.94
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