{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:KS6VOFFHNYVM7M6VO4LTBTLTIE","short_pith_number":"pith:KS6VOFFH","canonical_record":{"source":{"id":"1701.05145","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.soft","submitted_at":"2017-01-18T16:59:30Z","cross_cats_sorted":["physics.bio-ph","physics.flu-dyn"],"title_canon_sha256":"be06d87fb6cad7337ed23fbe26ee8ba6055dc6c7cdc7ad2a6f530ccfa03dbd6a","abstract_canon_sha256":"f9a86a6b6e2b60e724fd41b371dfff6fe524a4c4dfd94546e10e91665e0232e9"},"schema_version":"1.0"},"canonical_sha256":"54bd5714a76e2acfb3d5771730cd7341207abea307baabe7e2a65307bf40390b","source":{"kind":"arxiv","id":"1701.05145","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1701.05145","created_at":"2026-05-18T00:52:33Z"},{"alias_kind":"arxiv_version","alias_value":"1701.05145v1","created_at":"2026-05-18T00:52:33Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1701.05145","created_at":"2026-05-18T00:52:33Z"},{"alias_kind":"pith_short_12","alias_value":"KS6VOFFHNYVM","created_at":"2026-05-18T12:31:28Z"},{"alias_kind":"pith_short_16","alias_value":"KS6VOFFHNYVM7M6V","created_at":"2026-05-18T12:31:28Z"},{"alias_kind":"pith_short_8","alias_value":"KS6VOFFH","created_at":"2026-05-18T12:31:28Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:KS6VOFFHNYVM7M6VO4LTBTLTIE","target":"record","payload":{"canonical_record":{"source":{"id":"1701.05145","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.soft","submitted_at":"2017-01-18T16:59:30Z","cross_cats_sorted":["physics.bio-ph","physics.flu-dyn"],"title_canon_sha256":"be06d87fb6cad7337ed23fbe26ee8ba6055dc6c7cdc7ad2a6f530ccfa03dbd6a","abstract_canon_sha256":"f9a86a6b6e2b60e724fd41b371dfff6fe524a4c4dfd94546e10e91665e0232e9"},"schema_version":"1.0"},"canonical_sha256":"54bd5714a76e2acfb3d5771730cd7341207abea307baabe7e2a65307bf40390b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:52:33.100019Z","signature_b64":"1iEMXIMHO+ZyXWP9TcVCIZFJFPDqYWMrZxxNFieqySQg1STFkkrBlCTM9Dxwv/mzZ8O16PTidfYPzpoZiDDZBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"54bd5714a76e2acfb3d5771730cd7341207abea307baabe7e2a65307bf40390b","last_reissued_at":"2026-05-18T00:52:33.099581Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:52:33.099581Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1701.05145","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":"2026-05-18T00:52:33Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"6XC6N0PfHmtN0EXGX28rUAZo6amtlhJGKJRxYBlCcPxG0mRnkaVqJvkfS9tAvnIUyRNYfjw4RRGv0Wu0YZSgDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-11T00:52:37.378814Z"},"content_sha256":"efb9825827b33d728572fd9e83fb16a547d6d9408dd2b89d53216234fe98043c","schema_version":"1.0","event_id":"sha256:efb9825827b33d728572fd9e83fb16a547d6d9408dd2b89d53216234fe98043c"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:KS6VOFFHNYVM7M6VO4LTBTLTIE","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Clustering instability of focused swimmers","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.bio-ph","physics.flu-dyn"],"primary_cat":"cond-mat.soft","authors_text":"Eric Lauga, Francois Nadal","submitted_at":"2017-01-18T16:59:30Z","abstract_excerpt":"One of the hallmarks of active matter is its rich nonlinear dynamics and instabilities. Recent numerical simulations of phototactic algae showed that a thin jet of swimmers, obtained from hydrodynamic focusing inside a Poiseuille flow, was unstable to longitudinal perturbations with swimmers dynamically clustering (Jibuti et al., Phys. Rev. E, 90, 2014). As a simple starting point to understand these instabilities, we consider in this paper an initially homogeneous one-dimensional line of aligned swimmers moving along the same direction, and characterise its instability using both a continuum "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1701.05145","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":"2026-05-18T00:52:33Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+NaKDJJvmOUZANVkLxh1G/fbKAMlUphY2bQsVV+nxzBecxGIZ5hXe5VRkQLHW74taz4EkuTdDNuwxJom9rxlBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-11T00:52:37.379646Z"},"content_sha256":"38ac2d2e8731703fa2ffddbc5b1a0465d76f9caa00ce8d204f6214f7e6c40c84","schema_version":"1.0","event_id":"sha256:38ac2d2e8731703fa2ffddbc5b1a0465d76f9caa00ce8d204f6214f7e6c40c84"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/KS6VOFFHNYVM7M6VO4LTBTLTIE/bundle.json","state_url":"https://pith.science/pith/KS6VOFFHNYVM7M6VO4LTBTLTIE/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/KS6VOFFHNYVM7M6VO4LTBTLTIE/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":"2026-06-11T00:52:37Z","links":{"resolver":"https://pith.science/pith/KS6VOFFHNYVM7M6VO4LTBTLTIE","bundle":"https://pith.science/pith/KS6VOFFHNYVM7M6VO4LTBTLTIE/bundle.json","state":"https://pith.science/pith/KS6VOFFHNYVM7M6VO4LTBTLTIE/state.json","well_known_bundle":"https://pith.science/.well-known/pith/KS6VOFFHNYVM7M6VO4LTBTLTIE/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:KS6VOFFHNYVM7M6VO4LTBTLTIE","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":"f9a86a6b6e2b60e724fd41b371dfff6fe524a4c4dfd94546e10e91665e0232e9","cross_cats_sorted":["physics.bio-ph","physics.flu-dyn"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.soft","submitted_at":"2017-01-18T16:59:30Z","title_canon_sha256":"be06d87fb6cad7337ed23fbe26ee8ba6055dc6c7cdc7ad2a6f530ccfa03dbd6a"},"schema_version":"1.0","source":{"id":"1701.05145","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1701.05145","created_at":"2026-05-18T00:52:33Z"},{"alias_kind":"arxiv_version","alias_value":"1701.05145v1","created_at":"2026-05-18T00:52:33Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1701.05145","created_at":"2026-05-18T00:52:33Z"},{"alias_kind":"pith_short_12","alias_value":"KS6VOFFHNYVM","created_at":"2026-05-18T12:31:28Z"},{"alias_kind":"pith_short_16","alias_value":"KS6VOFFHNYVM7M6V","created_at":"2026-05-18T12:31:28Z"},{"alias_kind":"pith_short_8","alias_value":"KS6VOFFH","created_at":"2026-05-18T12:31:28Z"}],"graph_snapshots":[{"event_id":"sha256:38ac2d2e8731703fa2ffddbc5b1a0465d76f9caa00ce8d204f6214f7e6c40c84","target":"graph","created_at":"2026-05-18T00:52:33Z","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":"One of the hallmarks of active matter is its rich nonlinear dynamics and instabilities. Recent numerical simulations of phototactic algae showed that a thin jet of swimmers, obtained from hydrodynamic focusing inside a Poiseuille flow, was unstable to longitudinal perturbations with swimmers dynamically clustering (Jibuti et al., Phys. Rev. E, 90, 2014). As a simple starting point to understand these instabilities, we consider in this paper an initially homogeneous one-dimensional line of aligned swimmers moving along the same direction, and characterise its instability using both a continuum ","authors_text":"Eric Lauga, Francois Nadal","cross_cats":["physics.bio-ph","physics.flu-dyn"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.soft","submitted_at":"2017-01-18T16:59:30Z","title":"Clustering instability of focused swimmers"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1701.05145","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:efb9825827b33d728572fd9e83fb16a547d6d9408dd2b89d53216234fe98043c","target":"record","created_at":"2026-05-18T00:52:33Z","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":"f9a86a6b6e2b60e724fd41b371dfff6fe524a4c4dfd94546e10e91665e0232e9","cross_cats_sorted":["physics.bio-ph","physics.flu-dyn"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.soft","submitted_at":"2017-01-18T16:59:30Z","title_canon_sha256":"be06d87fb6cad7337ed23fbe26ee8ba6055dc6c7cdc7ad2a6f530ccfa03dbd6a"},"schema_version":"1.0","source":{"id":"1701.05145","kind":"arxiv","version":1}},"canonical_sha256":"54bd5714a76e2acfb3d5771730cd7341207abea307baabe7e2a65307bf40390b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"54bd5714a76e2acfb3d5771730cd7341207abea307baabe7e2a65307bf40390b","first_computed_at":"2026-05-18T00:52:33.099581Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:52:33.099581Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"1iEMXIMHO+ZyXWP9TcVCIZFJFPDqYWMrZxxNFieqySQg1STFkkrBlCTM9Dxwv/mzZ8O16PTidfYPzpoZiDDZBA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:52:33.100019Z","signed_message":"canonical_sha256_bytes"},"source_id":"1701.05145","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:efb9825827b33d728572fd9e83fb16a547d6d9408dd2b89d53216234fe98043c","sha256:38ac2d2e8731703fa2ffddbc5b1a0465d76f9caa00ce8d204f6214f7e6c40c84"],"state_sha256":"7a82b99b9a5aefa3057d4c38fa5461ce186a8d3f002126c9b0f67f6bfe38a28e"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"VzGJgV7kgKAOHdk944pYVzFR2f6bNNTzj5jekmYnTP0MJLVp8cUPr0/hSJZApY9Rj8AfdyHKr9OwWlQfLa0OBg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-11T00:52:37.384233Z","bundle_sha256":"863c68cbb28c38906e036e865c891df9f46ae3da8189f255e650e276c94692e9"}}