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Whether this effect is real and what causes it is unresolved.","posed_since":"2016","precise":"In Fabry-Perot microcavities under vibrational strong coupling (Rabi splitting of order $100\\, \\mathrm{cm}^{-1}$ for a reactant vibration) and no external pumping, determine whether thermal rate constants $k(T)$ differ from those of identical out-of-cavity or detuned-cavity controls beyond errors from heating, concentration and mixing, and if so identify the mechanism. An answer is a reproducible rate change with controls plus a quantitative theory, or a demonstration that reported changes come from artifacts.","problem_ref":null,"references":"","settled_by":"Multi-laboratory measurements with blinded cavity tuning, in situ temperature monitoring and matched controls, combined with a theory that predicts the sign and size of the change.","status_note":"In the literature checked (through 2025) positive reports and failed replications coexist and no mechanism is accepted.","title":"Do cavity-coupled vibrations change thermal reaction 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