Critical Ising Model on the Periodic Cubic Lattice $(\mathbb{Z}/L\mathbb{Z})^{3}$

Abstract: We investigate the critical behaviour of the nearest-neighbour Ising model on the three-dimensional periodic cubic lattice $(\mathbb{Z}/L\mathbb{Z})<sup>{3}$, and we present a companion set of Monte Carlo simulations. After recalling the rigorous results on the continuity of the spontaneous magnetization in $d=3$ and the triviality of the scaling limit in $d\ge 4$, we compile modern high-precision estimates of the 3D Ising critical exponents and verify the scaling relations that connect them. We then describe numerical measurements of the Binder cumulant, the magnetic susceptibility, the specific heat, the two-point correlation function, and the finite-size scaling of the magnetization. We discuss the systematic uncertainties that affect the extraction of the exponent ratios $γ/ν$ and $α/ν$, and we emphasize that an exponential fit of the correlation function is not appropriate at the critical point, where the decay is algebraic.