{"paper":{"title":"Test of Lorentz invariance with spin precession of ultracold neutrons","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"nucl-ex","authors_text":"A. Knecht, A. Kozela, A. Mtchedlishvili, A. Pazgalev, A. Weis, B. Lauss, C. A. Baker, D. Rebreyend, D. Shiers, E. Gutsmiedl, E. Pierre, F. Kuchler, G. Ban, G. Bison, G. Petzoldt, G. Pignol, G. Qu\\'em\\'ener, G. Rogel, G. Zsigmond, I. Altarev, J. M. Pendlebury, J. Zejma, K. Bodek, K. Green, K. Kirch, M. Daum, M. G. D. van der Grinten, M. Horras, M. Ku\\'zniak, M. Rebetez, N. Khomutov, N. Severijns, O. Naviliat-Cuncic, P. Fierlinger, P. Geltenbort, P. G. Harris, P. Iaydjiev, P. Knowles, R. Henneck, S. Kistryn, S. N. Ivanov, S. Roccia, T. Lauer, T. Lefort, W. Heil, Yu. Sobolev","submitted_at":"2009-05-20T05:51:05Z","abstract_excerpt":"A clock comparison experiment, analyzing the ratio of spin precession frequencies of stored ultracold neutrons and $^{199}$Hg atoms is reported. %57 No daily variation of this ratio could be found, from which is set an upper limit on the Lorentz invariance violating cosmic anisotropy field $b_{\\bot} < 2 \\times 10^{-20} {\\rm eV}$ (95% C.L.). This is the first limit for the free neutron. This result is also interpreted as a direct limit on the gravitational dipole moment of the neutron $|g_n| < 0.3 $eV/$c^2$ m from a spin-dependent interaction with the Sun. Analyzing the gravitational interactio"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0905.3221","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/0905.3221/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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"}