{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:TWEG6FY3DQJV4B75BMEB5JBKKP","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"a9dac128671d10420d1fdb7cd2d34ba2d0e1816a35ddb02120f1f0f8739c6087","cross_cats_sorted":["physics.flu-dyn","quant-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.quant-gas","submitted_at":"2018-01-15T12:57:35Z","title_canon_sha256":"7d709fb3789180fb1bfbe12431aa34842a29ca7525398e48753a6b8c4a0fbf78"},"schema_version":"1.0","source":{"id":"1801.04779","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1801.04779","created_at":"2026-05-18T00:06:46Z"},{"alias_kind":"arxiv_version","alias_value":"1801.04779v2","created_at":"2026-05-18T00:06:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1801.04779","created_at":"2026-05-18T00:06:46Z"},{"alias_kind":"pith_short_12","alias_value":"TWEG6FY3DQJV","created_at":"2026-05-18T12:32:56Z"},{"alias_kind":"pith_short_16","alias_value":"TWEG6FY3DQJV4B75","created_at":"2026-05-18T12:32:56Z"},{"alias_kind":"pith_short_8","alias_value":"TWEG6FY3","created_at":"2026-05-18T12:32:56Z"}],"graph_snapshots":[{"event_id":"sha256:967306c766efe1d5f99add7362c91e4cd3a0a827a161c3ae5774341a248e7a78","target":"graph","created_at":"2026-05-18T00:06:46Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"Negative effective masses can be realised by engineering the dispersion relation in a variety of quantum systems. A recent experiment with spin-orbit coupled Bose-Einstein condensates has shown that a negative effective mass can halt the free expansion of the condensate and produce fringes in the density [M. Khamehchi et al., Phys. Rev. Lett. 118, 155301 (2017)]. Here, we show that the observed fringes are due to the negativity of only one of the two effective mass parameters that characterise the dispersion, which leads to previously predicted self-interference of the wave packet. We show how","authors_text":"David Colas, Fabrice P. Laussy, Matthew J. Davis","cross_cats":["physics.flu-dyn","quant-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.quant-gas","submitted_at":"2018-01-15T12:57:35Z","title":"Negative-mass effects in spin-orbit coupled Bose-Einstein condensates"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1801.04779","kind":"arxiv","version":2},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:4aa97c4c8b297cf117e0860a44fd521b156e4d1df2c77775c8892cbdbc7e2039","target":"record","created_at":"2026-05-18T00:06:46Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"a9dac128671d10420d1fdb7cd2d34ba2d0e1816a35ddb02120f1f0f8739c6087","cross_cats_sorted":["physics.flu-dyn","quant-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.quant-gas","submitted_at":"2018-01-15T12:57:35Z","title_canon_sha256":"7d709fb3789180fb1bfbe12431aa34842a29ca7525398e48753a6b8c4a0fbf78"},"schema_version":"1.0","source":{"id":"1801.04779","kind":"arxiv","version":2}},"canonical_sha256":"9d886f171b1c135e07fd0b081ea42a53f72efda7d95cd178356dd660a1594f1c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"9d886f171b1c135e07fd0b081ea42a53f72efda7d95cd178356dd660a1594f1c","first_computed_at":"2026-05-18T00:06:46.323716Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:06:46.323716Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"FH2u9LdTldxumVv8WbaciFuNI8zpqL2SXJH7Pym5JEl4R6HeVPht5CvYDgDGv6DukY6L4sBw353uJpgrn2AFCA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:06:46.324363Z","signed_message":"canonical_sha256_bytes"},"source_id":"1801.04779","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:4aa97c4c8b297cf117e0860a44fd521b156e4d1df2c77775c8892cbdbc7e2039","sha256:967306c766efe1d5f99add7362c91e4cd3a0a827a161c3ae5774341a248e7a78"],"state_sha256":"95545d52edd9734d012c5807d0aed595f0002e6dc77709126a137b1c3c48331b"}