{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:Y5HUCSFMXCLJGUMELXL2IKOWUL","short_pith_number":"pith:Y5HUCSFM","canonical_record":{"source":{"id":"1505.04643","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.bio-ph","submitted_at":"2015-05-18T13:53:44Z","cross_cats_sorted":["q-bio.CB"],"title_canon_sha256":"465c9ef468f67b4c66b04d45976ac01ddbbeb62b5296dd6cc7e51db66907c86f","abstract_canon_sha256":"4c7642da263a74a6f8a9706716ebb212711b0ad60a25e84b8c243518032c9abf"},"schema_version":"1.0"},"canonical_sha256":"c74f4148acb8969351845dd7a429d6a2ca5a1b372127f6dafdc2e8c9effeadbc","source":{"kind":"arxiv","id":"1505.04643","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1505.04643","created_at":"2026-05-18T01:58:26Z"},{"alias_kind":"arxiv_version","alias_value":"1505.04643v2","created_at":"2026-05-18T01:58:26Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1505.04643","created_at":"2026-05-18T01:58:26Z"},{"alias_kind":"pith_short_12","alias_value":"Y5HUCSFMXCLJ","created_at":"2026-05-18T12:29:50Z"},{"alias_kind":"pith_short_16","alias_value":"Y5HUCSFMXCLJGUME","created_at":"2026-05-18T12:29:50Z"},{"alias_kind":"pith_short_8","alias_value":"Y5HUCSFM","created_at":"2026-05-18T12:29:50Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:Y5HUCSFMXCLJGUMELXL2IKOWUL","target":"record","payload":{"canonical_record":{"source":{"id":"1505.04643","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.bio-ph","submitted_at":"2015-05-18T13:53:44Z","cross_cats_sorted":["q-bio.CB"],"title_canon_sha256":"465c9ef468f67b4c66b04d45976ac01ddbbeb62b5296dd6cc7e51db66907c86f","abstract_canon_sha256":"4c7642da263a74a6f8a9706716ebb212711b0ad60a25e84b8c243518032c9abf"},"schema_version":"1.0"},"canonical_sha256":"c74f4148acb8969351845dd7a429d6a2ca5a1b372127f6dafdc2e8c9effeadbc","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:58:26.640488Z","signature_b64":"+WqibtbVtKl7Yd8Wq5ZCKz9+leE/5CGhjcCqEfWsz5m/5P/cWyeTPn6Ga0qQrLm7tegqFBjCSw2nsHVS4nELAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c74f4148acb8969351845dd7a429d6a2ca5a1b372127f6dafdc2e8c9effeadbc","last_reissued_at":"2026-05-18T01:58:26.639924Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:58:26.639924Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1505.04643","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":"2026-05-18T01:58:26Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"pmjTij/vtZR/m/L54HkVq58t3d8nKMOtuSCYS42/Hrcf7SL8gf8pw3bIqZiey1i528gVlin5vR7OvVBY69flCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-06T19:47:07.767717Z"},"content_sha256":"4c5d7e694673e4354518f4826254221458a05ee7d2def0cce285392ee0b24476","schema_version":"1.0","event_id":"sha256:4c5d7e694673e4354518f4826254221458a05ee7d2def0cce285392ee0b24476"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:Y5HUCSFMXCLJGUMELXL2IKOWUL","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Emergence and Persistence of Collective Cell Migration on Small Circular Micropatterns","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["q-bio.CB"],"primary_cat":"physics.bio-ph","authors_text":"Alicia Piera Alberola, Erwin Frey, Felix J. Segerer, Florian Th\\\"uroff, Joachim O. R\\\"adler","submitted_at":"2015-05-18T13:53:44Z","abstract_excerpt":"The spontaneous formation of vortices is a hallmark of collective cellular activity. Here, we study the onset and persistence of coherent angular motion (CAMo) as a function of the number of cells $N$ confined in circular micropatterns. We find that the persistence of CAMo increases with $N$ but exhibits a pronounced discontinuity accompanied by a geometric rearrangement of cells to a configuration containing a central cell. Computer simulations based on a generalized Potts model reproduce the emergence of vortex states and show in agreement with experiment that their stability depends on the "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1505.04643","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":""},"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":"2026-05-18T01:58:26Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"K6uXY/xILw06L+4dC4FEKhxxj3KgFAI0o+QsOtl0dLseNNjpxrKQN7d3mVqwHdFkLNEhj7lViXsQ92vHPgnFAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-06T19:47:07.768417Z"},"content_sha256":"5b0ef63977fe1d6f7d1cbbf540edf31bf235f75922bb9c65df5db747fc20b3c4","schema_version":"1.0","event_id":"sha256:5b0ef63977fe1d6f7d1cbbf540edf31bf235f75922bb9c65df5db747fc20b3c4"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/Y5HUCSFMXCLJGUMELXL2IKOWUL/bundle.json","state_url":"https://pith.science/pith/Y5HUCSFMXCLJGUMELXL2IKOWUL/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/Y5HUCSFMXCLJGUMELXL2IKOWUL/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":"2026-06-06T19:47:07Z","links":{"resolver":"https://pith.science/pith/Y5HUCSFMXCLJGUMELXL2IKOWUL","bundle":"https://pith.science/pith/Y5HUCSFMXCLJGUMELXL2IKOWUL/bundle.json","state":"https://pith.science/pith/Y5HUCSFMXCLJGUMELXL2IKOWUL/state.json","well_known_bundle":"https://pith.science/.well-known/pith/Y5HUCSFMXCLJGUMELXL2IKOWUL/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:Y5HUCSFMXCLJGUMELXL2IKOWUL","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":"4c7642da263a74a6f8a9706716ebb212711b0ad60a25e84b8c243518032c9abf","cross_cats_sorted":["q-bio.CB"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.bio-ph","submitted_at":"2015-05-18T13:53:44Z","title_canon_sha256":"465c9ef468f67b4c66b04d45976ac01ddbbeb62b5296dd6cc7e51db66907c86f"},"schema_version":"1.0","source":{"id":"1505.04643","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1505.04643","created_at":"2026-05-18T01:58:26Z"},{"alias_kind":"arxiv_version","alias_value":"1505.04643v2","created_at":"2026-05-18T01:58:26Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1505.04643","created_at":"2026-05-18T01:58:26Z"},{"alias_kind":"pith_short_12","alias_value":"Y5HUCSFMXCLJ","created_at":"2026-05-18T12:29:50Z"},{"alias_kind":"pith_short_16","alias_value":"Y5HUCSFMXCLJGUME","created_at":"2026-05-18T12:29:50Z"},{"alias_kind":"pith_short_8","alias_value":"Y5HUCSFM","created_at":"2026-05-18T12:29:50Z"}],"graph_snapshots":[{"event_id":"sha256:5b0ef63977fe1d6f7d1cbbf540edf31bf235f75922bb9c65df5db747fc20b3c4","target":"graph","created_at":"2026-05-18T01:58:26Z","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":"The spontaneous formation of vortices is a hallmark of collective cellular activity. Here, we study the onset and persistence of coherent angular motion (CAMo) as a function of the number of cells $N$ confined in circular micropatterns. We find that the persistence of CAMo increases with $N$ but exhibits a pronounced discontinuity accompanied by a geometric rearrangement of cells to a configuration containing a central cell. Computer simulations based on a generalized Potts model reproduce the emergence of vortex states and show in agreement with experiment that their stability depends on the ","authors_text":"Alicia Piera Alberola, Erwin Frey, Felix J. Segerer, Florian Th\\\"uroff, Joachim O. R\\\"adler","cross_cats":["q-bio.CB"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.bio-ph","submitted_at":"2015-05-18T13:53:44Z","title":"Emergence and Persistence of Collective Cell Migration on Small Circular Micropatterns"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1505.04643","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":"sha256:4c5d7e694673e4354518f4826254221458a05ee7d2def0cce285392ee0b24476","target":"record","created_at":"2026-05-18T01:58:26Z","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":"4c7642da263a74a6f8a9706716ebb212711b0ad60a25e84b8c243518032c9abf","cross_cats_sorted":["q-bio.CB"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.bio-ph","submitted_at":"2015-05-18T13:53:44Z","title_canon_sha256":"465c9ef468f67b4c66b04d45976ac01ddbbeb62b5296dd6cc7e51db66907c86f"},"schema_version":"1.0","source":{"id":"1505.04643","kind":"arxiv","version":2}},"canonical_sha256":"c74f4148acb8969351845dd7a429d6a2ca5a1b372127f6dafdc2e8c9effeadbc","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c74f4148acb8969351845dd7a429d6a2ca5a1b372127f6dafdc2e8c9effeadbc","first_computed_at":"2026-05-18T01:58:26.639924Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:58:26.639924Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"+WqibtbVtKl7Yd8Wq5ZCKz9+leE/5CGhjcCqEfWsz5m/5P/cWyeTPn6Ga0qQrLm7tegqFBjCSw2nsHVS4nELAw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:58:26.640488Z","signed_message":"canonical_sha256_bytes"},"source_id":"1505.04643","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:4c5d7e694673e4354518f4826254221458a05ee7d2def0cce285392ee0b24476","sha256:5b0ef63977fe1d6f7d1cbbf540edf31bf235f75922bb9c65df5db747fc20b3c4"],"state_sha256":"e87299ade3e13a7f48ef36a4700c61d352d705846801c6add95dfebd33622514"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"HEht0raAxDuJHD9wgUwLdr6uj9270qNkCyhU4sMO2dvQqr/+bpuJADJ8BSf4tMt5hP8ruh/XaE2+4dbZ1Ah2AA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-06T19:47:07.771931Z","bundle_sha256":"f46f4af39846c7579e45d30e0a72c39634fe65c744f0a6998fd2b9c46746d4ae"}}