{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:DMOMQ2PTE4UKAIHKDWZYHXYZ2U","short_pith_number":"pith:DMOMQ2PT","canonical_record":{"source":{"id":"1307.3426","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"q-bio.CB","submitted_at":"2013-07-12T11:57:33Z","cross_cats_sorted":["cond-mat.soft","q-bio.SC"],"title_canon_sha256":"80127b8faac96e61d2ab26bf579bcde93aae5625fcd3400a5e185487f955ca58","abstract_canon_sha256":"d93603a73d5ddf84ce98a87626bddc60037d892ece5ac0ea3cc068c432b52e8b"},"schema_version":"1.0"},"canonical_sha256":"1b1cc869f32728a020ea1db383df19d507cbf30f1c42520d8e1cb0147dab820c","source":{"kind":"arxiv","id":"1307.3426","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1307.3426","created_at":"2026-05-18T02:58:43Z"},{"alias_kind":"arxiv_version","alias_value":"1307.3426v3","created_at":"2026-05-18T02:58:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1307.3426","created_at":"2026-05-18T02:58:43Z"},{"alias_kind":"pith_short_12","alias_value":"DMOMQ2PTE4UK","created_at":"2026-05-18T12:27:43Z"},{"alias_kind":"pith_short_16","alias_value":"DMOMQ2PTE4UKAIHK","created_at":"2026-05-18T12:27:43Z"},{"alias_kind":"pith_short_8","alias_value":"DMOMQ2PT","created_at":"2026-05-18T12:27:43Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:DMOMQ2PTE4UKAIHKDWZYHXYZ2U","target":"record","payload":{"canonical_record":{"source":{"id":"1307.3426","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"q-bio.CB","submitted_at":"2013-07-12T11:57:33Z","cross_cats_sorted":["cond-mat.soft","q-bio.SC"],"title_canon_sha256":"80127b8faac96e61d2ab26bf579bcde93aae5625fcd3400a5e185487f955ca58","abstract_canon_sha256":"d93603a73d5ddf84ce98a87626bddc60037d892ece5ac0ea3cc068c432b52e8b"},"schema_version":"1.0"},"canonical_sha256":"1b1cc869f32728a020ea1db383df19d507cbf30f1c42520d8e1cb0147dab820c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:58:43.146292Z","signature_b64":"B4GrFJ5cWIwZER0DJHaQt6hiqvfsknqVHsd3lcjImi8mxM/s0QSFK3wfZj9V5Pu+8pbzpx1KHCah45lawB/YAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"1b1cc869f32728a020ea1db383df19d507cbf30f1c42520d8e1cb0147dab820c","last_reissued_at":"2026-05-18T02:58:43.145691Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:58:43.145691Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1307.3426","source_version":3,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T02:58:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+vHLh0kLMKnro9KKQzJCRJwYodOE2g1K6x2AClTGADYUfhCHzCzZTrD/GlbVTMdKfo3yRMUmyS2+HfjMZuH4Aw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T11:49:54.018678Z"},"content_sha256":"eb555fe067b17631bc164ac8f34f66a7f8ee277aefc5119c23a2ceef71284aa7","schema_version":"1.0","event_id":"sha256:eb555fe067b17631bc164ac8f34f66a7f8ee277aefc5119c23a2ceef71284aa7"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:DMOMQ2PTE4UKAIHKDWZYHXYZ2U","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Active polar fluid flow in finite droplets","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.soft","q-bio.SC"],"primary_cat":"q-bio.CB","authors_text":"Carl A. Whitfield, Davide Marenduzzo, Rapha\\\"el Voituriez, Rhoda J. Hawkins","submitted_at":"2013-07-12T11:57:33Z","abstract_excerpt":"We present a continuum level analytical model of a droplet of active contractile fluid consisting of filaments and motors. We calculate the steady state flows that result from a splayed polarisation of the filaments. We account for the interaction with an arbitrary external medium by imposing a viscous friction at the fixed droplet boundary. We then show that the droplet has non-zero force dipole and quadrupole moments, the latter of which is essential for self-propelled motion of the droplet at low Reynolds' number. Therefore, this calculation describes a simple mechanism for the motility of "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1307.3426","kind":"arxiv","version":3},"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":"2026-05-18T02:58:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/+ghuGYitsSuU48WX0kLWn5AICY6T9OIzpM3zx2st5ozrJqQDnD+WV4zFKRbHFipV5KhKjhaPFe9DKxw93ceBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T11:49:54.019266Z"},"content_sha256":"40ba8fef2e84452e76f2fd5306b86145837b845fb7ea52a7c92804ed1dcacab5","schema_version":"1.0","event_id":"sha256:40ba8fef2e84452e76f2fd5306b86145837b845fb7ea52a7c92804ed1dcacab5"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/DMOMQ2PTE4UKAIHKDWZYHXYZ2U/bundle.json","state_url":"https://pith.science/pith/DMOMQ2PTE4UKAIHKDWZYHXYZ2U/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/DMOMQ2PTE4UKAIHKDWZYHXYZ2U/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":"2026-05-26T11:49:54Z","links":{"resolver":"https://pith.science/pith/DMOMQ2PTE4UKAIHKDWZYHXYZ2U","bundle":"https://pith.science/pith/DMOMQ2PTE4UKAIHKDWZYHXYZ2U/bundle.json","state":"https://pith.science/pith/DMOMQ2PTE4UKAIHKDWZYHXYZ2U/state.json","well_known_bundle":"https://pith.science/.well-known/pith/DMOMQ2PTE4UKAIHKDWZYHXYZ2U/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:DMOMQ2PTE4UKAIHKDWZYHXYZ2U","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":"d93603a73d5ddf84ce98a87626bddc60037d892ece5ac0ea3cc068c432b52e8b","cross_cats_sorted":["cond-mat.soft","q-bio.SC"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"q-bio.CB","submitted_at":"2013-07-12T11:57:33Z","title_canon_sha256":"80127b8faac96e61d2ab26bf579bcde93aae5625fcd3400a5e185487f955ca58"},"schema_version":"1.0","source":{"id":"1307.3426","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1307.3426","created_at":"2026-05-18T02:58:43Z"},{"alias_kind":"arxiv_version","alias_value":"1307.3426v3","created_at":"2026-05-18T02:58:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1307.3426","created_at":"2026-05-18T02:58:43Z"},{"alias_kind":"pith_short_12","alias_value":"DMOMQ2PTE4UK","created_at":"2026-05-18T12:27:43Z"},{"alias_kind":"pith_short_16","alias_value":"DMOMQ2PTE4UKAIHK","created_at":"2026-05-18T12:27:43Z"},{"alias_kind":"pith_short_8","alias_value":"DMOMQ2PT","created_at":"2026-05-18T12:27:43Z"}],"graph_snapshots":[{"event_id":"sha256:40ba8fef2e84452e76f2fd5306b86145837b845fb7ea52a7c92804ed1dcacab5","target":"graph","created_at":"2026-05-18T02:58:43Z","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 a continuum level analytical model of a droplet of active contractile fluid consisting of filaments and motors. We calculate the steady state flows that result from a splayed polarisation of the filaments. We account for the interaction with an arbitrary external medium by imposing a viscous friction at the fixed droplet boundary. We then show that the droplet has non-zero force dipole and quadrupole moments, the latter of which is essential for self-propelled motion of the droplet at low Reynolds' number. Therefore, this calculation describes a simple mechanism for the motility of ","authors_text":"Carl A. Whitfield, Davide Marenduzzo, Rapha\\\"el Voituriez, Rhoda J. Hawkins","cross_cats":["cond-mat.soft","q-bio.SC"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"q-bio.CB","submitted_at":"2013-07-12T11:57:33Z","title":"Active polar fluid flow in finite droplets"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1307.3426","kind":"arxiv","version":3},"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:eb555fe067b17631bc164ac8f34f66a7f8ee277aefc5119c23a2ceef71284aa7","target":"record","created_at":"2026-05-18T02:58:43Z","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":"d93603a73d5ddf84ce98a87626bddc60037d892ece5ac0ea3cc068c432b52e8b","cross_cats_sorted":["cond-mat.soft","q-bio.SC"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"q-bio.CB","submitted_at":"2013-07-12T11:57:33Z","title_canon_sha256":"80127b8faac96e61d2ab26bf579bcde93aae5625fcd3400a5e185487f955ca58"},"schema_version":"1.0","source":{"id":"1307.3426","kind":"arxiv","version":3}},"canonical_sha256":"1b1cc869f32728a020ea1db383df19d507cbf30f1c42520d8e1cb0147dab820c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"1b1cc869f32728a020ea1db383df19d507cbf30f1c42520d8e1cb0147dab820c","first_computed_at":"2026-05-18T02:58:43.145691Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:58:43.145691Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"B4GrFJ5cWIwZER0DJHaQt6hiqvfsknqVHsd3lcjImi8mxM/s0QSFK3wfZj9V5Pu+8pbzpx1KHCah45lawB/YAQ==","signature_status":"signed_v1","signed_at":"2026-05-18T02:58:43.146292Z","signed_message":"canonical_sha256_bytes"},"source_id":"1307.3426","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:eb555fe067b17631bc164ac8f34f66a7f8ee277aefc5119c23a2ceef71284aa7","sha256:40ba8fef2e84452e76f2fd5306b86145837b845fb7ea52a7c92804ed1dcacab5"],"state_sha256":"502e8979ea927ab1421b3bb0dd02e1442d7c046f8e54766257ae0bf8f647df38"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"8pHxVfacnYqlEJhFk4syza/J0Lk9ncDlBqkhmuvyNe7cweD+4YhoX3tP7MISqzD6BtKYq/6EpPB/YiiN6/WZCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T11:49:54.022077Z","bundle_sha256":"8048bf43f57e7c0458ddf9219b3092dfe4f4d63d97414760d0c73f93dba0bb6a"}}