{"paper":{"title":"Variation of the Fine-Structure Constant and Laser Cooling of Atomic Dysprosium","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.atom-ph","authors_text":"A. Cing\\\"oz, A. Lapierre, A.-T Nguyen, D. Budker, J. R. Torgerson, N. A. Leefer, S. J. Ferrell, S. K. Lamoreaux, V. V. Yashchuk","submitted_at":"2008-11-24T23:07:23Z","abstract_excerpt":"Radio-frequency electric-dipole transitions between nearly degenerate, opposite parity levels of atomic dysprosium (Dy) were monitored over an eight-month period to search for a variation in the fine-structure constant, $\\alpha$. The data provide a rate of fractional temporal variation of $\\alpha$ of $(-2.4\\pm2.3)\\times10^{-15}$ yr$^{-1}$ or a value of $(-7.8 \\pm 5.9) \\times 10^{-6}$ for $k_\\alpha$, the variation coefficient for $\\alpha$ in a changing gravitational potential. All results indicate the absence of significant variation at the present level of sensitivity. We also present initial "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0811.3992","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}