{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:VWUCXTBWRG3IPHLWJK6FDJLUZR","short_pith_number":"pith:VWUCXTBW","canonical_record":{"source":{"id":"1908.04072","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2019-08-12T10:01:29Z","cross_cats_sorted":["cond-mat.soft"],"title_canon_sha256":"49239c64996083b09c13f10f80776574c6b5b6873c0c32292695326e19984c7b","abstract_canon_sha256":"ff7b758ec2624414ace98285f1cbd91fe0496b98053d4ad9b0a97494fda913d4"},"schema_version":"1.0"},"canonical_sha256":"ada82bcc3689b6879d764abc51a574cc64377b2cabf22519fd40fb063d3b14cb","source":{"kind":"arxiv","id":"1908.04072","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1908.04072","created_at":"2026-07-05T01:12:22Z"},{"alias_kind":"arxiv_version","alias_value":"1908.04072v2","created_at":"2026-07-05T01:12:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1908.04072","created_at":"2026-07-05T01:12:22Z"},{"alias_kind":"pith_short_12","alias_value":"VWUCXTBWRG3I","created_at":"2026-07-05T01:12:22Z"},{"alias_kind":"pith_short_16","alias_value":"VWUCXTBWRG3IPHLW","created_at":"2026-07-05T01:12:22Z"},{"alias_kind":"pith_short_8","alias_value":"VWUCXTBW","created_at":"2026-07-05T01:12:22Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:VWUCXTBWRG3IPHLWJK6FDJLUZR","target":"record","payload":{"canonical_record":{"source":{"id":"1908.04072","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2019-08-12T10:01:29Z","cross_cats_sorted":["cond-mat.soft"],"title_canon_sha256":"49239c64996083b09c13f10f80776574c6b5b6873c0c32292695326e19984c7b","abstract_canon_sha256":"ff7b758ec2624414ace98285f1cbd91fe0496b98053d4ad9b0a97494fda913d4"},"schema_version":"1.0"},"canonical_sha256":"ada82bcc3689b6879d764abc51a574cc64377b2cabf22519fd40fb063d3b14cb","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T01:12:22.072942Z","signature_b64":"tUT5QwiCi+1RYJijEjWq95/YccPE9bcD15NkTbvj1ktU0lbx3PSLxc54lT0MJvGsO8M5lwT6dYNeourS0xusCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ada82bcc3689b6879d764abc51a574cc64377b2cabf22519fd40fb063d3b14cb","last_reissued_at":"2026-07-05T01:12:22.072558Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T01:12:22.072558Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1908.04072","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":"2026-07-05T01:12:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"mB5ci0NpCcr1vuJMN5P8yPW+JtdTsObhAa1xJXAAMQNBlvjJR+8a2wLQlkzNjWZ+1+Mg4ILieSFm7jkWDkFxCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-16T08:01:58.681007Z"},"content_sha256":"7da5a6f9f6411945ec18d48ec077a6a70fcdc62acb54a0f3b6eb8bed92940b25","schema_version":"1.0","event_id":"sha256:7da5a6f9f6411945ec18d48ec077a6a70fcdc62acb54a0f3b6eb8bed92940b25"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:VWUCXTBWRG3IPHLWJK6FDJLUZR","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The assembly of freely moving rigid fibers measures the flow gradient tensor","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.soft"],"primary_cat":"physics.flu-dyn","authors_text":"A. Mazzino, M. Cavaiola, S. Olivieri","submitted_at":"2019-08-12T10:01:29Z","abstract_excerpt":"The motion of an assembly of rigid fibers is investigated for different classes of closed streamline flows, steady or time dependent, two dimensional or three dimensional. In our study, the dynamics of the fiber assembly is fully-coupled to the flow field by means of a state-of-the-art immersed boundary method. We show that, for sufficiently small Stokes times of the assembly, the whole flow gradient tensor can be accurately reconstructed by simply tracking the fiber assembly and measuring suitable fiber velocity differences evaluated at the fiber ends. Our results strongly suggest the possibi"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1908.04072","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/1908.04072/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":"2026-07-05T01:12:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"9mdMpm8LcU+o03tPSM51z2Icg8rqIl1wU0mP/cGJJtgIUNoALF0I1AWuI57iJX6hPwrar+yFXM47IFTx/9ARBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-16T08:01:58.681504Z"},"content_sha256":"e71772e38975925d0853e2486735343062b6aec9eb8d2fc49b5dd465a4d2fde7","schema_version":"1.0","event_id":"sha256:e71772e38975925d0853e2486735343062b6aec9eb8d2fc49b5dd465a4d2fde7"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/VWUCXTBWRG3IPHLWJK6FDJLUZR/bundle.json","state_url":"https://pith.science/pith/VWUCXTBWRG3IPHLWJK6FDJLUZR/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/VWUCXTBWRG3IPHLWJK6FDJLUZR/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":"2026-08-16T08:01:58Z","links":{"resolver":"https://pith.science/pith/VWUCXTBWRG3IPHLWJK6FDJLUZR","bundle":"https://pith.science/pith/VWUCXTBWRG3IPHLWJK6FDJLUZR/bundle.json","state":"https://pith.science/pith/VWUCXTBWRG3IPHLWJK6FDJLUZR/state.json","well_known_bundle":"https://pith.science/.well-known/pith/VWUCXTBWRG3IPHLWJK6FDJLUZR/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:VWUCXTBWRG3IPHLWJK6FDJLUZR","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":"ff7b758ec2624414ace98285f1cbd91fe0496b98053d4ad9b0a97494fda913d4","cross_cats_sorted":["cond-mat.soft"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2019-08-12T10:01:29Z","title_canon_sha256":"49239c64996083b09c13f10f80776574c6b5b6873c0c32292695326e19984c7b"},"schema_version":"1.0","source":{"id":"1908.04072","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1908.04072","created_at":"2026-07-05T01:12:22Z"},{"alias_kind":"arxiv_version","alias_value":"1908.04072v2","created_at":"2026-07-05T01:12:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1908.04072","created_at":"2026-07-05T01:12:22Z"},{"alias_kind":"pith_short_12","alias_value":"VWUCXTBWRG3I","created_at":"2026-07-05T01:12:22Z"},{"alias_kind":"pith_short_16","alias_value":"VWUCXTBWRG3IPHLW","created_at":"2026-07-05T01:12:22Z"},{"alias_kind":"pith_short_8","alias_value":"VWUCXTBW","created_at":"2026-07-05T01:12:22Z"}],"graph_snapshots":[{"event_id":"sha256:e71772e38975925d0853e2486735343062b6aec9eb8d2fc49b5dd465a4d2fde7","target":"graph","created_at":"2026-07-05T01:12:22Z","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/1908.04072/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The motion of an assembly of rigid fibers is investigated for different classes of closed streamline flows, steady or time dependent, two dimensional or three dimensional. In our study, the dynamics of the fiber assembly is fully-coupled to the flow field by means of a state-of-the-art immersed boundary method. We show that, for sufficiently small Stokes times of the assembly, the whole flow gradient tensor can be accurately reconstructed by simply tracking the fiber assembly and measuring suitable fiber velocity differences evaluated at the fiber ends. Our results strongly suggest the possibi","authors_text":"A. Mazzino, M. Cavaiola, S. Olivieri","cross_cats":["cond-mat.soft"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2019-08-12T10:01:29Z","title":"The assembly of freely moving rigid fibers measures the flow gradient tensor"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1908.04072","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":"sha256:7da5a6f9f6411945ec18d48ec077a6a70fcdc62acb54a0f3b6eb8bed92940b25","target":"record","created_at":"2026-07-05T01:12:22Z","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":"ff7b758ec2624414ace98285f1cbd91fe0496b98053d4ad9b0a97494fda913d4","cross_cats_sorted":["cond-mat.soft"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2019-08-12T10:01:29Z","title_canon_sha256":"49239c64996083b09c13f10f80776574c6b5b6873c0c32292695326e19984c7b"},"schema_version":"1.0","source":{"id":"1908.04072","kind":"arxiv","version":2}},"canonical_sha256":"ada82bcc3689b6879d764abc51a574cc64377b2cabf22519fd40fb063d3b14cb","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ada82bcc3689b6879d764abc51a574cc64377b2cabf22519fd40fb063d3b14cb","first_computed_at":"2026-07-05T01:12:22.072558Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T01:12:22.072558Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"tUT5QwiCi+1RYJijEjWq95/YccPE9bcD15NkTbvj1ktU0lbx3PSLxc54lT0MJvGsO8M5lwT6dYNeourS0xusCg==","signature_status":"signed_v1","signed_at":"2026-07-05T01:12:22.072942Z","signed_message":"canonical_sha256_bytes"},"source_id":"1908.04072","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:7da5a6f9f6411945ec18d48ec077a6a70fcdc62acb54a0f3b6eb8bed92940b25","sha256:e71772e38975925d0853e2486735343062b6aec9eb8d2fc49b5dd465a4d2fde7"],"state_sha256":"edce08ea721c9208073800e154d76fb98fe8f23a9d56da59b09e2768f15b6c47"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+Qga6+gFO+JvBogojpsnnnVgrbjnx8O6DhihCb+6wchN2C1+BvfwpzxBH2sxB0gszLVC+o0x2SNQyFlRzyzGCQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-16T08:01:58.685663Z","bundle_sha256":"18efe8f07c663763a306fcf464d4f333ed9500a0473ea5db11ee06f6875d5a41"}}