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Such ideas predict light, weakly coupled particles instead of heavy ones.","posed_since":"2015","precise":"Assess mechanisms in which v is fixed dynamically by cosmological evolution (relaxion scanning of $m_h^{2}$, NNaturalness, crunching of regions with large v) rather than by TeV-scale symmetry. An answer is a consistent model that reproduces $v = 246\\,\\mathrm{GeV}$ without large tuning and an experimental signature (for example relaxion-Higgs mixing or fifth forces) that can confirm or exclude it.","problem_ref":null,"references":"","settled_by":"Detection or exclusion of the light scalar predicted by relaxation models through Higgs-mixing searches, fifth-force tests and rare-decay searches across its allowed mass range.","status_note":"Relaxion proposals date from 2015; consistent models exist but require long inflation or other non-minimal features, and none has a confirmed signature.","title":"Is the weak scale set by cosmological dynamics or 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