{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:G7K2WP54PAM67L36QROMIDAAV3","short_pith_number":"pith:G7K2WP54","canonical_record":{"source":{"id":"2111.13591","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.quant-gas","submitted_at":"2021-11-26T16:37:28Z","cross_cats_sorted":["nucl-ex","nucl-th"],"title_canon_sha256":"e2ad72a780d6d4c8037fccfca1916c0f22526292978d42c62c13fab2283e43c5","abstract_canon_sha256":"b7f8035873e347a1da3bc580c0076645475fb82d89249eb2d29cf42b8fc577f8"},"schema_version":"1.0"},"canonical_sha256":"37d5ab3fbc7819efaf7e845cc40c00aeddda3881a00f4c16247f834fc01a95d7","source":{"kind":"arxiv","id":"2111.13591","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2111.13591","created_at":"2026-07-05T03:35:22Z"},{"alias_kind":"arxiv_version","alias_value":"2111.13591v1","created_at":"2026-07-05T03:35:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2111.13591","created_at":"2026-07-05T03:35:22Z"},{"alias_kind":"pith_short_12","alias_value":"G7K2WP54PAM6","created_at":"2026-07-05T03:35:22Z"},{"alias_kind":"pith_short_16","alias_value":"G7K2WP54PAM67L36","created_at":"2026-07-05T03:35:22Z"},{"alias_kind":"pith_short_8","alias_value":"G7K2WP54","created_at":"2026-07-05T03:35:22Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:G7K2WP54PAM67L36QROMIDAAV3","target":"record","payload":{"canonical_record":{"source":{"id":"2111.13591","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.quant-gas","submitted_at":"2021-11-26T16:37:28Z","cross_cats_sorted":["nucl-ex","nucl-th"],"title_canon_sha256":"e2ad72a780d6d4c8037fccfca1916c0f22526292978d42c62c13fab2283e43c5","abstract_canon_sha256":"b7f8035873e347a1da3bc580c0076645475fb82d89249eb2d29cf42b8fc577f8"},"schema_version":"1.0"},"canonical_sha256":"37d5ab3fbc7819efaf7e845cc40c00aeddda3881a00f4c16247f834fc01a95d7","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T03:35:22.779176Z","signature_b64":"v8pKFiiIaeTxQVtuja9NaUy+SK3af02kY3dpEjDeHTNeNkIev6utgSU7stOh1xus7ndS4MfS1/SaedwtGGPUDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"37d5ab3fbc7819efaf7e845cc40c00aeddda3881a00f4c16247f834fc01a95d7","last_reissued_at":"2026-07-05T03:35:22.778697Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T03:35:22.778697Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2111.13591","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T03:35:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+B921bR6mGSCxzzR2HKbqLVET+9afMU/KRTwLghU66xpnX+/QVzrXDlroHQD1XDexevMddJGyxxqw9C5rYoSDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-07T04:33:39.549296Z"},"content_sha256":"3bdce14891900cccdb4578e820f4bf1e291e3d3a423a03c8666bf7ea9331bc3c","schema_version":"1.0","event_id":"sha256:3bdce14891900cccdb4578e820f4bf1e291e3d3a423a03c8666bf7ea9331bc3c"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:G7K2WP54PAM67L36QROMIDAAV3","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"How many particles do make a fluid? Qualifying collective behavior in expanding ultracold gases","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["nucl-ex","nucl-th"],"primary_cat":"cond-mat.quant-gas","authors_text":"Giuliano Giacalone, Lars H. Heyen, Leena Tharwat, Stefan Floerchinger","submitted_at":"2021-11-26T16:37:28Z","abstract_excerpt":"Collective phenomena in quantum many-body systems are often described in terms of hydrodynamics, an appropriate framework when the involved particle numbers are effectively macroscopic. We propose to use experiments on expanding clouds of few and many interacting cold atoms to investigate the emergence of hydrodynamics as a function of particle number. We consider gases confined in two-dimensional elliptically-deformed traps, and we employ the manifestation of elliptic flow as an indicator of collective behavior. We quantify the response of the gas to the deformation of the trapping potential,"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2111.13591","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2111.13591/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T03:35:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"wvPdlTNV5JzATy2thu+qCl16kdF/wMcizO2HBwLO0xlP6ZSwUa9pl2NW0CFWm0NUzMLeLXh/LP5wctkOQ8COBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-07T04:33:39.549700Z"},"content_sha256":"381717e24efb3cc5efe16113bbc506b507eeb4025cf099470de28efc44dd7d1f","schema_version":"1.0","event_id":"sha256:381717e24efb3cc5efe16113bbc506b507eeb4025cf099470de28efc44dd7d1f"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/G7K2WP54PAM67L36QROMIDAAV3/bundle.json","state_url":"https://pith.science/pith/G7K2WP54PAM67L36QROMIDAAV3/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/G7K2WP54PAM67L36QROMIDAAV3/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":"2026-07-07T04:33:39Z","links":{"resolver":"https://pith.science/pith/G7K2WP54PAM67L36QROMIDAAV3","bundle":"https://pith.science/pith/G7K2WP54PAM67L36QROMIDAAV3/bundle.json","state":"https://pith.science/pith/G7K2WP54PAM67L36QROMIDAAV3/state.json","well_known_bundle":"https://pith.science/.well-known/pith/G7K2WP54PAM67L36QROMIDAAV3/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:G7K2WP54PAM67L36QROMIDAAV3","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":"b7f8035873e347a1da3bc580c0076645475fb82d89249eb2d29cf42b8fc577f8","cross_cats_sorted":["nucl-ex","nucl-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.quant-gas","submitted_at":"2021-11-26T16:37:28Z","title_canon_sha256":"e2ad72a780d6d4c8037fccfca1916c0f22526292978d42c62c13fab2283e43c5"},"schema_version":"1.0","source":{"id":"2111.13591","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2111.13591","created_at":"2026-07-05T03:35:22Z"},{"alias_kind":"arxiv_version","alias_value":"2111.13591v1","created_at":"2026-07-05T03:35:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2111.13591","created_at":"2026-07-05T03:35:22Z"},{"alias_kind":"pith_short_12","alias_value":"G7K2WP54PAM6","created_at":"2026-07-05T03:35:22Z"},{"alias_kind":"pith_short_16","alias_value":"G7K2WP54PAM67L36","created_at":"2026-07-05T03:35:22Z"},{"alias_kind":"pith_short_8","alias_value":"G7K2WP54","created_at":"2026-07-05T03:35:22Z"}],"graph_snapshots":[{"event_id":"sha256:381717e24efb3cc5efe16113bbc506b507eeb4025cf099470de28efc44dd7d1f","target":"graph","created_at":"2026-07-05T03:35:22Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2111.13591/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Collective phenomena in quantum many-body systems are often described in terms of hydrodynamics, an appropriate framework when the involved particle numbers are effectively macroscopic. We propose to use experiments on expanding clouds of few and many interacting cold atoms to investigate the emergence of hydrodynamics as a function of particle number. We consider gases confined in two-dimensional elliptically-deformed traps, and we employ the manifestation of elliptic flow as an indicator of collective behavior. We quantify the response of the gas to the deformation of the trapping potential,","authors_text":"Giuliano Giacalone, Lars H. Heyen, Leena Tharwat, Stefan Floerchinger","cross_cats":["nucl-ex","nucl-th"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.quant-gas","submitted_at":"2021-11-26T16:37:28Z","title":"How many particles do make a fluid? Qualifying collective behavior in expanding ultracold gases"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2111.13591","kind":"arxiv","version":1},"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":"sha256:3bdce14891900cccdb4578e820f4bf1e291e3d3a423a03c8666bf7ea9331bc3c","target":"record","created_at":"2026-07-05T03:35:22Z","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":"b7f8035873e347a1da3bc580c0076645475fb82d89249eb2d29cf42b8fc577f8","cross_cats_sorted":["nucl-ex","nucl-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.quant-gas","submitted_at":"2021-11-26T16:37:28Z","title_canon_sha256":"e2ad72a780d6d4c8037fccfca1916c0f22526292978d42c62c13fab2283e43c5"},"schema_version":"1.0","source":{"id":"2111.13591","kind":"arxiv","version":1}},"canonical_sha256":"37d5ab3fbc7819efaf7e845cc40c00aeddda3881a00f4c16247f834fc01a95d7","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"37d5ab3fbc7819efaf7e845cc40c00aeddda3881a00f4c16247f834fc01a95d7","first_computed_at":"2026-07-05T03:35:22.778697Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:35:22.778697Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"v8pKFiiIaeTxQVtuja9NaUy+SK3af02kY3dpEjDeHTNeNkIev6utgSU7stOh1xus7ndS4MfS1/SaedwtGGPUDw==","signature_status":"signed_v1","signed_at":"2026-07-05T03:35:22.779176Z","signed_message":"canonical_sha256_bytes"},"source_id":"2111.13591","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3bdce14891900cccdb4578e820f4bf1e291e3d3a423a03c8666bf7ea9331bc3c","sha256:381717e24efb3cc5efe16113bbc506b507eeb4025cf099470de28efc44dd7d1f"],"state_sha256":"d6eb8f9bd053c79916b31b8bae0ae3091b04aa289ff960422b62c62c69a67a5d"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"BShcWK1vZnQ7CLjzqcx60aHhSr2mCcr2K5cQQfGeaCiNRxgcNqZJb3pPql7SONlAui3EdQU/xM3NNuQpJLAcAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-07T04:33:39.551690Z","bundle_sha256":"c2d3d26e39645d479d9ec5bce0d1fdd90f00ad5dc85623e5a8085afc45861f04"}}