We simulate the $N$-spin critical Ising model on a square lattice using Glauber dynamics and consider the typical one-unit time equal to $N$ single-spin-flip attempts. The divergence of correlation time with the linear extent of the system results in critical slowing down, a challenge to equilibration because the spin configurations generated in such a way are temporally correlated. We examine temporal correlations in the number of accepted spin flips and show a signature of nontrivial long-time correlation of a logarithmically decaying form, or the corresponding power spectral density follows canonical $1/f$ noise.

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• Critical phenomena
• Lattice models in statistical physics
• Ising model
• Monte Carlo methods
• Scaling methods