{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:ZSFT5TH3RN3STBDFF6ZOHHG7DD","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":"668648be3797713b27a96cf8dbaadef545584d167e5d29628f3eed35861246b3","cross_cats_sorted":["quant-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.quant-gas","submitted_at":"2016-09-18T06:59:06Z","title_canon_sha256":"5e5973aecad542b48c57d00fd73ae65d63468973b194ccfcdb099169390374fc"},"schema_version":"1.0","source":{"id":"1609.05435","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1609.05435","created_at":"2026-05-18T00:07:23Z"},{"alias_kind":"arxiv_version","alias_value":"1609.05435v2","created_at":"2026-05-18T00:07:23Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1609.05435","created_at":"2026-05-18T00:07:23Z"},{"alias_kind":"pith_short_12","alias_value":"ZSFT5TH3RN3S","created_at":"2026-05-18T12:30:55Z"},{"alias_kind":"pith_short_16","alias_value":"ZSFT5TH3RN3STBDF","created_at":"2026-05-18T12:30:55Z"},{"alias_kind":"pith_short_8","alias_value":"ZSFT5TH3","created_at":"2026-05-18T12:30:55Z"}],"graph_snapshots":[{"event_id":"sha256:40b6aa1488191ab27f234514ca912219fc3e399f3ca63d2eb374a1260d64381f","target":"graph","created_at":"2026-05-18T00:07:23Z","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":"The BEC regime of a cold fermi gas is characterised by coupled atoms (dimers) which, superficially, look like elementary bosons. We examine how simply-bosonic they really are; firstly, in the Bogoliubov approximation and further, through new actions for the BEC regime in which dimers are represented by coupled Gross-Pitaevskii fields. We find identity at the level of the Bogoliubov approximation in the deep BEC regime, permitting a simple Gross-Pitaevskii description. This fails rapidly as we move towards the BCS regime. However, even in the deep BEC regime there is an intrinsic difference if ","authors_text":"Chi-Yong Lin, Da-Shin Lee, D. A. Steer, David J. Weir, Ray J. Rivers","cross_cats":["quant-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.quant-gas","submitted_at":"2016-09-18T06:59:06Z","title":"When are two fermions a simple boson? New Gross-Pitaevskii actions for cold Fermi condensates"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1609.05435","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":"sha256:885c606b76885032d9cd171fc4143b0dd62b23caec0533794e0bfd82204a8c6c","target":"record","created_at":"2026-05-18T00:07:23Z","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":"668648be3797713b27a96cf8dbaadef545584d167e5d29628f3eed35861246b3","cross_cats_sorted":["quant-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.quant-gas","submitted_at":"2016-09-18T06:59:06Z","title_canon_sha256":"5e5973aecad542b48c57d00fd73ae65d63468973b194ccfcdb099169390374fc"},"schema_version":"1.0","source":{"id":"1609.05435","kind":"arxiv","version":2}},"canonical_sha256":"cc8b3eccfb8b772984652fb2e39cdf18c56c43a0147717f56aca00ca14758916","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"cc8b3eccfb8b772984652fb2e39cdf18c56c43a0147717f56aca00ca14758916","first_computed_at":"2026-05-18T00:07:23.925331Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:07:23.925331Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ocC4NsFr/TgbJGX7yzWSCN83pb5k15SX7TSuVDeFrAnKarWn//gmtEVesouffC23cm+whmd6jvgxvWgKgsTYDA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:07:23.925769Z","signed_message":"canonical_sha256_bytes"},"source_id":"1609.05435","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:885c606b76885032d9cd171fc4143b0dd62b23caec0533794e0bfd82204a8c6c","sha256:40b6aa1488191ab27f234514ca912219fc3e399f3ca63d2eb374a1260d64381f"],"state_sha256":"e1cb34599b2b18d53ad7be574f2a58f9d3fc9a5dd197e032f062328d1076c6c5"}