{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2008:KPH6OPCWBPZ57X5RFLQJNFLEKH","short_pith_number":"pith:KPH6OPCW","canonical_record":{"source":{"id":"0805.3519","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/publicdomain/","primary_cat":"cond-mat.other","submitted_at":"2008-05-22T18:03:04Z","cross_cats_sorted":[],"title_canon_sha256":"1fbc244a5efa539af719f8e1ea3b8a38e19c80ef4bc56b3aa6bd0e35581b60f9","abstract_canon_sha256":"8cfd6f4a2a22b097e8538f6636d227bc32edc590f2411848ad35029d44471012"},"schema_version":"1.0"},"canonical_sha256":"53cfe73c560bf3dfdfb12ae096956451ff0746747549e4dabe973076430f70b0","source":{"kind":"arxiv","id":"0805.3519","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0805.3519","created_at":"2026-05-18T02:15:52Z"},{"alias_kind":"arxiv_version","alias_value":"0805.3519v1","created_at":"2026-05-18T02:15:52Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0805.3519","created_at":"2026-05-18T02:15:52Z"},{"alias_kind":"pith_short_12","alias_value":"KPH6OPCWBPZ5","created_at":"2026-05-18T12:25:57Z"},{"alias_kind":"pith_short_16","alias_value":"KPH6OPCWBPZ57X5R","created_at":"2026-05-18T12:25:57Z"},{"alias_kind":"pith_short_8","alias_value":"KPH6OPCW","created_at":"2026-05-18T12:25:57Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2008:KPH6OPCWBPZ57X5RFLQJNFLEKH","target":"record","payload":{"canonical_record":{"source":{"id":"0805.3519","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/publicdomain/","primary_cat":"cond-mat.other","submitted_at":"2008-05-22T18:03:04Z","cross_cats_sorted":[],"title_canon_sha256":"1fbc244a5efa539af719f8e1ea3b8a38e19c80ef4bc56b3aa6bd0e35581b60f9","abstract_canon_sha256":"8cfd6f4a2a22b097e8538f6636d227bc32edc590f2411848ad35029d44471012"},"schema_version":"1.0"},"canonical_sha256":"53cfe73c560bf3dfdfb12ae096956451ff0746747549e4dabe973076430f70b0","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:15:52.470454Z","signature_b64":"8kblq5rgI2I8B/b+4C6J0RWgjdFFOMCSOPzCbVjjWb43mOxM3dPe20hVjzgYOp1Xpg7I7bFhi6YLBhArzgpeAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"53cfe73c560bf3dfdfb12ae096956451ff0746747549e4dabe973076430f70b0","last_reissued_at":"2026-05-18T02:15:52.469857Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:15:52.469857Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0805.3519","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":"2026-05-18T02:15:52Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Ohugq+whSTI04zNnrzZ1W7PIJIY/jsahKfEGG/kDm+96ni6fG+lyx9CuNPBGljZyM2ee9OBTyHi6t0FRawK/Cg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T11:02:25.734381Z"},"content_sha256":"b64636275f14181a73723d44f616b0b78de25db12767734464bf164ff53bdf73","schema_version":"1.0","event_id":"sha256:b64636275f14181a73723d44f616b0b78de25db12767734464bf164ff53bdf73"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2008:KPH6OPCWBPZ57X5RFLQJNFLEKH","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Observation of a 2D Bose-gas: from thermal to quasi-condensate to superfluid","license":"http://creativecommons.org/licenses/publicdomain/","headline":"","cross_cats":[],"primary_cat":"cond-mat.other","authors_text":"A. Ramanathan, C. Ryu, K. Helmerson, P. Clad\\'e, W. D. Phillips","submitted_at":"2008-05-22T18:03:04Z","abstract_excerpt":"We present experimental results on a Bose gas in a quasi-2D geometry near the Berezinskii, Kosterlitz and Thouless (BKT) transition temperature. By measuring the density profile, \\textit{in situ} and after time of flight, and the coherence length, we identify different states of the gas. In particular, we observe that the gas develops a bimodal distribution without long range order. In this state, the gas presents a longer coherence length than the thermal cloud; it is quasi-condensed but is not superfluid. Experimental evidence indicates that we observe the superfluid transition (BKT transiti"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0805.3519","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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T02:15:52Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"OZLiPk/0rc/TOsBbxKh25NI+YC/pC6Ql515ErdEq/abjxqM/H/vmbCtyFqgZ8rAQG780t5RFscHc4IcWDM+xDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T11:02:25.734793Z"},"content_sha256":"7ab60dfac71e50ec1f21c08a775eed60f8990e59aee03eb126f1b74f7ab557c8","schema_version":"1.0","event_id":"sha256:7ab60dfac71e50ec1f21c08a775eed60f8990e59aee03eb126f1b74f7ab557c8"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/KPH6OPCWBPZ57X5RFLQJNFLEKH/bundle.json","state_url":"https://pith.science/pith/KPH6OPCWBPZ57X5RFLQJNFLEKH/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/KPH6OPCWBPZ57X5RFLQJNFLEKH/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":"2026-05-26T11:02:25Z","links":{"resolver":"https://pith.science/pith/KPH6OPCWBPZ57X5RFLQJNFLEKH","bundle":"https://pith.science/pith/KPH6OPCWBPZ57X5RFLQJNFLEKH/bundle.json","state":"https://pith.science/pith/KPH6OPCWBPZ57X5RFLQJNFLEKH/state.json","well_known_bundle":"https://pith.science/.well-known/pith/KPH6OPCWBPZ57X5RFLQJNFLEKH/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2008:KPH6OPCWBPZ57X5RFLQJNFLEKH","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":"8cfd6f4a2a22b097e8538f6636d227bc32edc590f2411848ad35029d44471012","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/publicdomain/","primary_cat":"cond-mat.other","submitted_at":"2008-05-22T18:03:04Z","title_canon_sha256":"1fbc244a5efa539af719f8e1ea3b8a38e19c80ef4bc56b3aa6bd0e35581b60f9"},"schema_version":"1.0","source":{"id":"0805.3519","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0805.3519","created_at":"2026-05-18T02:15:52Z"},{"alias_kind":"arxiv_version","alias_value":"0805.3519v1","created_at":"2026-05-18T02:15:52Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0805.3519","created_at":"2026-05-18T02:15:52Z"},{"alias_kind":"pith_short_12","alias_value":"KPH6OPCWBPZ5","created_at":"2026-05-18T12:25:57Z"},{"alias_kind":"pith_short_16","alias_value":"KPH6OPCWBPZ57X5R","created_at":"2026-05-18T12:25:57Z"},{"alias_kind":"pith_short_8","alias_value":"KPH6OPCW","created_at":"2026-05-18T12:25:57Z"}],"graph_snapshots":[{"event_id":"sha256:7ab60dfac71e50ec1f21c08a775eed60f8990e59aee03eb126f1b74f7ab557c8","target":"graph","created_at":"2026-05-18T02:15:52Z","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 present experimental results on a Bose gas in a quasi-2D geometry near the Berezinskii, Kosterlitz and Thouless (BKT) transition temperature. By measuring the density profile, \\textit{in situ} and after time of flight, and the coherence length, we identify different states of the gas. In particular, we observe that the gas develops a bimodal distribution without long range order. In this state, the gas presents a longer coherence length than the thermal cloud; it is quasi-condensed but is not superfluid. Experimental evidence indicates that we observe the superfluid transition (BKT transiti","authors_text":"A. Ramanathan, C. Ryu, K. Helmerson, P. Clad\\'e, W. D. Phillips","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/publicdomain/","primary_cat":"cond-mat.other","submitted_at":"2008-05-22T18:03:04Z","title":"Observation of a 2D Bose-gas: from thermal to quasi-condensate to superfluid"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0805.3519","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:b64636275f14181a73723d44f616b0b78de25db12767734464bf164ff53bdf73","target":"record","created_at":"2026-05-18T02:15:52Z","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":"8cfd6f4a2a22b097e8538f6636d227bc32edc590f2411848ad35029d44471012","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/publicdomain/","primary_cat":"cond-mat.other","submitted_at":"2008-05-22T18:03:04Z","title_canon_sha256":"1fbc244a5efa539af719f8e1ea3b8a38e19c80ef4bc56b3aa6bd0e35581b60f9"},"schema_version":"1.0","source":{"id":"0805.3519","kind":"arxiv","version":1}},"canonical_sha256":"53cfe73c560bf3dfdfb12ae096956451ff0746747549e4dabe973076430f70b0","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"53cfe73c560bf3dfdfb12ae096956451ff0746747549e4dabe973076430f70b0","first_computed_at":"2026-05-18T02:15:52.469857Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:15:52.469857Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"8kblq5rgI2I8B/b+4C6J0RWgjdFFOMCSOPzCbVjjWb43mOxM3dPe20hVjzgYOp1Xpg7I7bFhi6YLBhArzgpeAA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:15:52.470454Z","signed_message":"canonical_sha256_bytes"},"source_id":"0805.3519","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b64636275f14181a73723d44f616b0b78de25db12767734464bf164ff53bdf73","sha256:7ab60dfac71e50ec1f21c08a775eed60f8990e59aee03eb126f1b74f7ab557c8"],"state_sha256":"0ff5059e0c2bcd7cd3e7bf4205e3ba5b52277257d30af1d323cd08c65dc566b9"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"lnn2pVwSkfIN2j56D5ZKmrwqDO181TkMlMvG91C20HfZmfi0x4SYAsRnqLV7924QkZ1g0BexK3HktGYJKb0eAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T11:02:25.737920Z","bundle_sha256":"791cce4b629abbcd2e409b1d13db63573dec1bf54c4738c8b8c7ab9501589c7a"}}