{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2010:TCOLBN3NIGKN7P6K6G7MCGOFCC","short_pith_number":"pith:TCOLBN3N","canonical_record":{"source":{"id":"1011.3737","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.quant-gas","submitted_at":"2010-11-16T15:48:53Z","cross_cats_sorted":[],"title_canon_sha256":"af13f8425106660bd7ee19079bf47d9c5945415905f827d21ebe98e238407bb4","abstract_canon_sha256":"af8a85d007c86285ee1277fdde7874051f21ddd0f174cac3c4980479a3f95b23"},"schema_version":"1.0"},"canonical_sha256":"989cb0b76d4194dfbfcaf1bec119c510877cef127b775ad2fc84ba03d2fda945","source":{"kind":"arxiv","id":"1011.3737","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1011.3737","created_at":"2026-05-18T02:23:36Z"},{"alias_kind":"arxiv_version","alias_value":"1011.3737v2","created_at":"2026-05-18T02:23:36Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1011.3737","created_at":"2026-05-18T02:23:36Z"},{"alias_kind":"pith_short_12","alias_value":"TCOLBN3NIGKN","created_at":"2026-05-18T12:26:13Z"},{"alias_kind":"pith_short_16","alias_value":"TCOLBN3NIGKN7P6K","created_at":"2026-05-18T12:26:13Z"},{"alias_kind":"pith_short_8","alias_value":"TCOLBN3N","created_at":"2026-05-18T12:26:13Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2010:TCOLBN3NIGKN7P6K6G7MCGOFCC","target":"record","payload":{"canonical_record":{"source":{"id":"1011.3737","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.quant-gas","submitted_at":"2010-11-16T15:48:53Z","cross_cats_sorted":[],"title_canon_sha256":"af13f8425106660bd7ee19079bf47d9c5945415905f827d21ebe98e238407bb4","abstract_canon_sha256":"af8a85d007c86285ee1277fdde7874051f21ddd0f174cac3c4980479a3f95b23"},"schema_version":"1.0"},"canonical_sha256":"989cb0b76d4194dfbfcaf1bec119c510877cef127b775ad2fc84ba03d2fda945","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:23:36.529048Z","signature_b64":"2D1GiWFne415b03R9XFpbAYRgFFFfI1sVJ5/y5va9FJ3dJDFO+w/dhKTUJf2Md5JVHBCN6Nw7ALTWZkMsetOCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"989cb0b76d4194dfbfcaf1bec119c510877cef127b775ad2fc84ba03d2fda945","last_reissued_at":"2026-05-18T02:23:36.528381Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:23:36.528381Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1011.3737","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T02:23:36Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"H3INJirVapY0p2b6U8Rxf6Nnrhb5nTl1Hq6DB3eBYqih8RuW5EcUYIUN7VjDqIykUD+IkYWTLiT1UjrsUdpAAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T08:51:22.049195Z"},"content_sha256":"0e8153e5e550bd4fb7f25c7f75fabca09f777e56d287847094d43aeedab4f6d4","schema_version":"1.0","event_id":"sha256:0e8153e5e550bd4fb7f25c7f75fabca09f777e56d287847094d43aeedab4f6d4"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2010:TCOLBN3NIGKN7P6K6G7MCGOFCC","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"BCS-BEC crossover in a two-dimensional Fermi gas","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.quant-gas","authors_text":"G. Bertaina, S. Giorgini","submitted_at":"2010-11-16T15:48:53Z","abstract_excerpt":"We investigate the crossover from Bardeen-Cooper-Schrieffer (BCS) superfluidity to Bose-Einstein condensation (BEC) in a two-dimensional Fermi gas at T=0 using the fixed-node diffusion Monte Carlo method. We calculate the equation of state and the gap parameter as a function of the interaction strength, observing large deviations compared to mean-field predictions. In the BEC regime our results show the important role of dimer-dimer and atom-dimer interaction effects that are completely neglected in the mean-field picture. Results on Tan's contact parameter associated with short-range physics "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1011.3737","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":""},"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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T02:23:36Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"V6PbWrfWKpXOuL02Wvy9EOxoJLOs5qx4RxKGbUVWXhm/SG8lMjLkaL4BK5Vyo2a/pubiFpSIxd4qrZyoOaHUBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T08:51:22.049921Z"},"content_sha256":"b53c6cd0d660e3be8a185626d21edae0c8cbaec1b7287f2960e1e92898432a28","schema_version":"1.0","event_id":"sha256:b53c6cd0d660e3be8a185626d21edae0c8cbaec1b7287f2960e1e92898432a28"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/TCOLBN3NIGKN7P6K6G7MCGOFCC/bundle.json","state_url":"https://pith.science/pith/TCOLBN3NIGKN7P6K6G7MCGOFCC/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/TCOLBN3NIGKN7P6K6G7MCGOFCC/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-05-27T08:51:22Z","links":{"resolver":"https://pith.science/pith/TCOLBN3NIGKN7P6K6G7MCGOFCC","bundle":"https://pith.science/pith/TCOLBN3NIGKN7P6K6G7MCGOFCC/bundle.json","state":"https://pith.science/pith/TCOLBN3NIGKN7P6K6G7MCGOFCC/state.json","well_known_bundle":"https://pith.science/.well-known/pith/TCOLBN3NIGKN7P6K6G7MCGOFCC/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2010:TCOLBN3NIGKN7P6K6G7MCGOFCC","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":"af8a85d007c86285ee1277fdde7874051f21ddd0f174cac3c4980479a3f95b23","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.quant-gas","submitted_at":"2010-11-16T15:48:53Z","title_canon_sha256":"af13f8425106660bd7ee19079bf47d9c5945415905f827d21ebe98e238407bb4"},"schema_version":"1.0","source":{"id":"1011.3737","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1011.3737","created_at":"2026-05-18T02:23:36Z"},{"alias_kind":"arxiv_version","alias_value":"1011.3737v2","created_at":"2026-05-18T02:23:36Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1011.3737","created_at":"2026-05-18T02:23:36Z"},{"alias_kind":"pith_short_12","alias_value":"TCOLBN3NIGKN","created_at":"2026-05-18T12:26:13Z"},{"alias_kind":"pith_short_16","alias_value":"TCOLBN3NIGKN7P6K","created_at":"2026-05-18T12:26:13Z"},{"alias_kind":"pith_short_8","alias_value":"TCOLBN3N","created_at":"2026-05-18T12:26:13Z"}],"graph_snapshots":[{"event_id":"sha256:b53c6cd0d660e3be8a185626d21edae0c8cbaec1b7287f2960e1e92898432a28","target":"graph","created_at":"2026-05-18T02:23:36Z","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":"We investigate the crossover from Bardeen-Cooper-Schrieffer (BCS) superfluidity to Bose-Einstein condensation (BEC) in a two-dimensional Fermi gas at T=0 using the fixed-node diffusion Monte Carlo method. We calculate the equation of state and the gap parameter as a function of the interaction strength, observing large deviations compared to mean-field predictions. In the BEC regime our results show the important role of dimer-dimer and atom-dimer interaction effects that are completely neglected in the mean-field picture. Results on Tan's contact parameter associated with short-range physics ","authors_text":"G. Bertaina, S. Giorgini","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.quant-gas","submitted_at":"2010-11-16T15:48:53Z","title":"BCS-BEC crossover in a two-dimensional Fermi gas"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1011.3737","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":"sha256:0e8153e5e550bd4fb7f25c7f75fabca09f777e56d287847094d43aeedab4f6d4","target":"record","created_at":"2026-05-18T02:23:36Z","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":"af8a85d007c86285ee1277fdde7874051f21ddd0f174cac3c4980479a3f95b23","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.quant-gas","submitted_at":"2010-11-16T15:48:53Z","title_canon_sha256":"af13f8425106660bd7ee19079bf47d9c5945415905f827d21ebe98e238407bb4"},"schema_version":"1.0","source":{"id":"1011.3737","kind":"arxiv","version":2}},"canonical_sha256":"989cb0b76d4194dfbfcaf1bec119c510877cef127b775ad2fc84ba03d2fda945","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"989cb0b76d4194dfbfcaf1bec119c510877cef127b775ad2fc84ba03d2fda945","first_computed_at":"2026-05-18T02:23:36.528381Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:23:36.528381Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"2D1GiWFne415b03R9XFpbAYRgFFFfI1sVJ5/y5va9FJ3dJDFO+w/dhKTUJf2Md5JVHBCN6Nw7ALTWZkMsetOCQ==","signature_status":"signed_v1","signed_at":"2026-05-18T02:23:36.529048Z","signed_message":"canonical_sha256_bytes"},"source_id":"1011.3737","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:0e8153e5e550bd4fb7f25c7f75fabca09f777e56d287847094d43aeedab4f6d4","sha256:b53c6cd0d660e3be8a185626d21edae0c8cbaec1b7287f2960e1e92898432a28"],"state_sha256":"6f50a93c1681bf8c24c46eaac93468ff18714e3339edc11d6945384484e6e757"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"6Ep0FKUG/tTQgtjM3+bxp50g64i7cUU+qSJdNQKoC/xY27gx1ADDCgSb7D8ItQwPmJG9hzqrLcWpHVDRRabuCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-27T08:51:22.053499Z","bundle_sha256":"6d71687d9dc936647d9af831b50f335bb69ea1bddbf502fae0f5100946e598c9"}}