{"paper":{"title":"Testing isotropy of the universe using the Ramsey resonance technique on ultracold neutron spins","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-ex","nucl-ex"],"primary_cat":"physics.atom-ph","authors_text":"A. Knecht, A. Kozela, A. Kraft, A. Mtchedlishvili, A. Pazgalev, A. Weis, B. Franke, B. Lauss, D. Rebreyend, E. Gutsmiedl, E. Pierre, F. M. Piegsa, G. Ban, G. Bison, G. Petzoldt, G. Pignol, G. Qu\\'em\\'ener, G. Zsigmond, I. Altarev, J. Zejma, J. Zenner, K. Bodek, K. Kirch, M. Daum, M. Fertl, M. Horras, M. Rebetez, N. Khomutov, N. Severijns, O. Naviliat-Cuncic, P. Fierlinger, P. Knowles, P. Schmidt-Wellenburg, R. Henneck, S. Kistryn, S. Roccia, T. Lauer, T. Lefort, W. Heil, Y. Lemi\\`ere, Yu. Sobolev","submitted_at":"2010-09-30T08:09:51Z","abstract_excerpt":"Physics at the Planck scale could be revealed by looking for tiny violations of fundamental symmetries in low energy experiments. In 2008, a sensitive test of the isotropy of the Universe using has been performed with stored ultracold neutrons (UCN), this is the first clock-comparison experiment performed with free neutrons. During several days we monitored the Larmor frequency of neutron spins in a weak magnetic field using the Ramsey resonance technique. An non-zero cosmic axial field, violating rotational symmetry, would induce a daily variation of the precession frequency. Our null result "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1009.6060","kind":"arxiv","version":1},"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"}