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An answer is a controlled calculation of $A(k,\\omega)$ and $\\xi(T)$ at strong coupling that discriminates the two.","problem_ref":null,"references":"","settled_by":"Diagrammatic Monte Carlo or cluster calculations with controlled convergence at $U/t \\sim 7$ showing whether the pseudogap opening tracks the growth of $\\xi(T)$.","status_note":"Diagrammatic Monte Carlo (2024) established a spin-fluctuation pseudogap at weak to intermediate coupling; cluster methods at stronger coupling point to short-range Mott physics.","title":"Origin of the Hubbard-model pseudogap at cuprate-like coupling 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