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Title: Existence of critical exponents for the 3D Ising model
Plain: Prove that quantities such as the decay of spin correlations at the critical temperature follow exact power laws in 3D. Their numerical values are known very precisely, but even their existence is unproven.
Precise: Nearest-neighbour Ising model on $Z^3$ at $\beta_c$. Prove that $\langle s_0 s_x\rangle_{\beta_c}=\left|x\right|^{-(1+\eta)+o(1)}$ and that the correlation length $\xi(\beta)=(\beta_c-\beta)^{-\nu+o(1)}$, with numerical values eta approximately 0.0363 and nu approximately 0.6300. Answer: a proof of existence of the limits, with or without their values.
Settled by: A proof that the exponents $\eta$ and $\nu$ exist as limits.
Kind: well-posed
Answer type: proof
References: (empty)
Literature status: open
Status note: Continuity of the phase transition in 3D was proven by Aizenman, Duminil-Copin and Sidoravicius (2015).
Posed since: (empty)