{"paper":{"title":"New limit on Lorentz and CPT violating neutron spin interactions using a free precession 3He-129Xe co-magnetometer","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.atom-ph"],"primary_cat":"gr-qc","authors_text":"A. Scharth (2), A. Schnabel (3), F. Allmendinger (1), Germany), Germany (2) Institut f\\\"ur Physik, Germany (3) Physikalisch-Technische Bundesanstalt Berlin, Heidelberg, Johannes Gutenberg-Universit\\\"at, K. Tullney (2) ((1) Physikalisches Institut, Mainz, Ruprecht-Karls-Universit\\\"at, S. Karpuk (2), U. Schmidt (1), W. Heil (2), W. Kilian (3), Yu. Sobolev (2)","submitted_at":"2013-12-11T16:17:32Z","abstract_excerpt":"We report on the search for a CPT and Lorentz invariance violating coupling of the 3He and 129Xe nuclear spins (each largely determined by a valence neutron) to background tensor fields which permeate the universe. Our experimental approach is to measure the free precession of nuclear spin polarized 3He and 129Xe atoms in a homogeneous magnetic guiding field of about 400 nT using LTC SQUIDs as low-noise magnetic flux detectors. As the laboratory reference frame rotates with respect to distant stars, we look for a sidereal modulation of the Larmor frequencies of the co-located spin samples. As "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1312.3225","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"}