C7 – Constants, Scales & Renormalization
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In https://opg.optica.org/optica/fulltext.cfm?id=572911&uri=optica-12-6-843 (Optica, 2025), the largest coordinated campaign to date is reported: 10 optical clocks in 6 countries were compared simultaneously over fiber and satellite links for weeks (including 38 evaluated frequency ratios). The FBA view turns this into a pass/fail program: not “the best clock,” but a preregistered consistency experiment that licenses link and…
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In https://arxiv.org/pdf/2504.09148 (preprint, 2026), Ding et al. show that, as the SRG resolution is lowered, a spin → pseudospin transition occurs and the familiar “magic numbers” become visible as robust shell gaps; they also report an increasingly important role of 3N forces for spin–orbit splittings in the low-resolution regime. The numerical data behind all figures are…