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The imitation of a real-world process using an analogous process that is easier to control and experiment with.
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Two-point-correlation in the 3D ising model
So in David Landau and Kurt Binder's book "A guide to Monte-Carlo simulations in statistical physics" (2021), they introduce the two-point correlation function as follows:
$$\Gamma(r) = \langle \rho(0) … Now I am confused because I don't see how one should think of this in terms of Monte-Carlo simulations.
Does that mean I choose (in each iteration) one (random?) …