{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:QXYVHXIS7XY6REO2W7VYS4E2IF","short_pith_number":"pith:QXYVHXIS","canonical_record":{"source":{"id":"1906.07822","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2019-06-18T21:42:53Z","cross_cats_sorted":[],"title_canon_sha256":"76e18f23ae00396d808c166a86fcc51c46cce63e9eaa2dd532cb4155771e21c9","abstract_canon_sha256":"f33765eb73bb87af2b31ee9a53bfbd4a67eeba8927a324f37d31162431c1c754"},"schema_version":"1.0"},"canonical_sha256":"85f153dd12fdf1e891dab7eb89709a415fa40a6263276f1e0a97db0fd1a9f7c4","source":{"kind":"arxiv","id":"1906.07822","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1906.07822","created_at":"2026-05-17T23:42:57Z"},{"alias_kind":"arxiv_version","alias_value":"1906.07822v1","created_at":"2026-05-17T23:42:57Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1906.07822","created_at":"2026-05-17T23:42:57Z"},{"alias_kind":"pith_short_12","alias_value":"QXYVHXIS7XY6","created_at":"2026-05-18T12:33:27Z"},{"alias_kind":"pith_short_16","alias_value":"QXYVHXIS7XY6REO2","created_at":"2026-05-18T12:33:27Z"},{"alias_kind":"pith_short_8","alias_value":"QXYVHXIS","created_at":"2026-05-18T12:33:27Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:QXYVHXIS7XY6REO2W7VYS4E2IF","target":"record","payload":{"canonical_record":{"source":{"id":"1906.07822","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2019-06-18T21:42:53Z","cross_cats_sorted":[],"title_canon_sha256":"76e18f23ae00396d808c166a86fcc51c46cce63e9eaa2dd532cb4155771e21c9","abstract_canon_sha256":"f33765eb73bb87af2b31ee9a53bfbd4a67eeba8927a324f37d31162431c1c754"},"schema_version":"1.0"},"canonical_sha256":"85f153dd12fdf1e891dab7eb89709a415fa40a6263276f1e0a97db0fd1a9f7c4","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:42:57.644268Z","signature_b64":"QfyMwhp0YqRpMkHNG26drvctIE8joe+to6YP6b1rD49FosbGhVY8oJmVPOBcVXASraQTFxG+vRduawd92E3FBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"85f153dd12fdf1e891dab7eb89709a415fa40a6263276f1e0a97db0fd1a9f7c4","last_reissued_at":"2026-05-17T23:42:57.643616Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:42:57.643616Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1906.07822","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":"2026-05-17T23:42:57Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"pOhupuGpt+GyFllJPcoR2nCbjkpbohXlz01rvOB8b/yIRMNHo7nPAvDDLd+BIFuo0k+U4lIVFgfqappwj6yjAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T15:39:19.631294Z"},"content_sha256":"38e8bd7e3dfad20564fbd7006e2b81c3d07b9c7cdbd3a2f36d86374b0dcbe2d5","schema_version":"1.0","event_id":"sha256:38e8bd7e3dfad20564fbd7006e2b81c3d07b9c7cdbd3a2f36d86374b0dcbe2d5"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:QXYVHXIS7XY6REO2W7VYS4E2IF","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Locally linear embedding for transient cylinder wakes","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.flu-dyn","authors_text":"Arthur Ehlert, Bernd R. Noack, Christian N. Nayeri, Marek Morzynski","submitted_at":"2019-06-18T21:42:53Z","abstract_excerpt":"Reduced-order representations of an ensemble of cylinder wake transients are investigated. Locally linear embedding identifies a two-dimensional manifold with a maximum error of 1% from new snapshot data. This representation outperforms a 50-dimensional POD expansion from the same data and is not obtainable with cluster-based coarse graining of similar order. This manifold resolves the steady solution, the stability eigenmodes, the first post-transient POD modes, the intermediate vortex shedding structure as well as higher harmonics. The snapshot data are generated by a direct numerical simula"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1906.07822","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":"2026-05-17T23:42:57Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"TANvcluJZgd6G3atgHMoLzR4+N8O7lyzB25DspbAuHcvXzrigD4HD18cGCjgSg9BA065B+3uNni7FgdcfRaQAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T15:39:19.631657Z"},"content_sha256":"7be0ea2077d2544e4909405daa7105303e8977890c6003b66799a0dfaddc7c52","schema_version":"1.0","event_id":"sha256:7be0ea2077d2544e4909405daa7105303e8977890c6003b66799a0dfaddc7c52"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/QXYVHXIS7XY6REO2W7VYS4E2IF/bundle.json","state_url":"https://pith.science/pith/QXYVHXIS7XY6REO2W7VYS4E2IF/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/QXYVHXIS7XY6REO2W7VYS4E2IF/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":"2026-06-02T15:39:19Z","links":{"resolver":"https://pith.science/pith/QXYVHXIS7XY6REO2W7VYS4E2IF","bundle":"https://pith.science/pith/QXYVHXIS7XY6REO2W7VYS4E2IF/bundle.json","state":"https://pith.science/pith/QXYVHXIS7XY6REO2W7VYS4E2IF/state.json","well_known_bundle":"https://pith.science/.well-known/pith/QXYVHXIS7XY6REO2W7VYS4E2IF/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:QXYVHXIS7XY6REO2W7VYS4E2IF","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":"f33765eb73bb87af2b31ee9a53bfbd4a67eeba8927a324f37d31162431c1c754","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2019-06-18T21:42:53Z","title_canon_sha256":"76e18f23ae00396d808c166a86fcc51c46cce63e9eaa2dd532cb4155771e21c9"},"schema_version":"1.0","source":{"id":"1906.07822","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1906.07822","created_at":"2026-05-17T23:42:57Z"},{"alias_kind":"arxiv_version","alias_value":"1906.07822v1","created_at":"2026-05-17T23:42:57Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1906.07822","created_at":"2026-05-17T23:42:57Z"},{"alias_kind":"pith_short_12","alias_value":"QXYVHXIS7XY6","created_at":"2026-05-18T12:33:27Z"},{"alias_kind":"pith_short_16","alias_value":"QXYVHXIS7XY6REO2","created_at":"2026-05-18T12:33:27Z"},{"alias_kind":"pith_short_8","alias_value":"QXYVHXIS","created_at":"2026-05-18T12:33:27Z"}],"graph_snapshots":[{"event_id":"sha256:7be0ea2077d2544e4909405daa7105303e8977890c6003b66799a0dfaddc7c52","target":"graph","created_at":"2026-05-17T23:42:57Z","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":"Reduced-order representations of an ensemble of cylinder wake transients are investigated. Locally linear embedding identifies a two-dimensional manifold with a maximum error of 1% from new snapshot data. This representation outperforms a 50-dimensional POD expansion from the same data and is not obtainable with cluster-based coarse graining of similar order. This manifold resolves the steady solution, the stability eigenmodes, the first post-transient POD modes, the intermediate vortex shedding structure as well as higher harmonics. The snapshot data are generated by a direct numerical simula","authors_text":"Arthur Ehlert, Bernd R. Noack, Christian N. Nayeri, Marek Morzynski","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2019-06-18T21:42:53Z","title":"Locally linear embedding for transient cylinder wakes"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1906.07822","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":"sha256:38e8bd7e3dfad20564fbd7006e2b81c3d07b9c7cdbd3a2f36d86374b0dcbe2d5","target":"record","created_at":"2026-05-17T23:42:57Z","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":"f33765eb73bb87af2b31ee9a53bfbd4a67eeba8927a324f37d31162431c1c754","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2019-06-18T21:42:53Z","title_canon_sha256":"76e18f23ae00396d808c166a86fcc51c46cce63e9eaa2dd532cb4155771e21c9"},"schema_version":"1.0","source":{"id":"1906.07822","kind":"arxiv","version":1}},"canonical_sha256":"85f153dd12fdf1e891dab7eb89709a415fa40a6263276f1e0a97db0fd1a9f7c4","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"85f153dd12fdf1e891dab7eb89709a415fa40a6263276f1e0a97db0fd1a9f7c4","first_computed_at":"2026-05-17T23:42:57.643616Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:42:57.643616Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"QfyMwhp0YqRpMkHNG26drvctIE8joe+to6YP6b1rD49FosbGhVY8oJmVPOBcVXASraQTFxG+vRduawd92E3FBQ==","signature_status":"signed_v1","signed_at":"2026-05-17T23:42:57.644268Z","signed_message":"canonical_sha256_bytes"},"source_id":"1906.07822","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:38e8bd7e3dfad20564fbd7006e2b81c3d07b9c7cdbd3a2f36d86374b0dcbe2d5","sha256:7be0ea2077d2544e4909405daa7105303e8977890c6003b66799a0dfaddc7c52"],"state_sha256":"1124a477d9c7cd0ae64f4e903c9dcd9ab443124e7393c1076620c78036e04c90"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"4zc3K/gO4Oqw4OwS5A8ixm7ky862RTM/UqZwlYR/sH2arhuE5DYV/Q2jIXeJp00A+uHC33HgHVhLr8dDWh2oAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-02T15:39:19.633941Z","bundle_sha256":"639fb9074bb5f724c52e0b09244c36591f6360a1fa768c482ed9783778536ea2"}}