{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2011:KBATRQHUFWSUBKJMT3MNZPCPSY","short_pith_number":"pith:KBATRQHU","canonical_record":{"source":{"id":"1102.0407","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.soft","submitted_at":"2011-02-02T11:50:54Z","cross_cats_sorted":["physics.bio-ph"],"title_canon_sha256":"16445e239898816e4ad80e08ff333f087fe52e43d784edd78d68dde694e86ed0","abstract_canon_sha256":"7aeb00e2e2a9dd6ed93864aa278fd1d2e696adf6e3573cca0176994aea1db7b0"},"schema_version":"1.0"},"canonical_sha256":"504138c0f42da540a92c9ed8dcbc4f962300609263a05a124cf253467d16d21f","source":{"kind":"arxiv","id":"1102.0407","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1102.0407","created_at":"2026-05-18T04:26:12Z"},{"alias_kind":"arxiv_version","alias_value":"1102.0407v1","created_at":"2026-05-18T04:26:12Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1102.0407","created_at":"2026-05-18T04:26:12Z"},{"alias_kind":"pith_short_12","alias_value":"KBATRQHUFWSU","created_at":"2026-05-18T12:26:32Z"},{"alias_kind":"pith_short_16","alias_value":"KBATRQHUFWSUBKJM","created_at":"2026-05-18T12:26:32Z"},{"alias_kind":"pith_short_8","alias_value":"KBATRQHU","created_at":"2026-05-18T12:26:32Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2011:KBATRQHUFWSUBKJMT3MNZPCPSY","target":"record","payload":{"canonical_record":{"source":{"id":"1102.0407","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.soft","submitted_at":"2011-02-02T11:50:54Z","cross_cats_sorted":["physics.bio-ph"],"title_canon_sha256":"16445e239898816e4ad80e08ff333f087fe52e43d784edd78d68dde694e86ed0","abstract_canon_sha256":"7aeb00e2e2a9dd6ed93864aa278fd1d2e696adf6e3573cca0176994aea1db7b0"},"schema_version":"1.0"},"canonical_sha256":"504138c0f42da540a92c9ed8dcbc4f962300609263a05a124cf253467d16d21f","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:26:12.767781Z","signature_b64":"Tfg9hLVFOH9RuMWh8aqWPJQ5crzzCtaLHdSqxBVN6BjYlLArjSxtGb36GyS5Qv0pjlIUk78UTiIyD/RftHjqDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"504138c0f42da540a92c9ed8dcbc4f962300609263a05a124cf253467d16d21f","last_reissued_at":"2026-05-18T04:26:12.767011Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:26:12.767011Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1102.0407","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":"2026-05-18T04:26:12Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"FesGec9HaU6CTXtfRWabj6TTNpHKkXkGn06Ww6Gdto3EqVCQh52bVi9OqE3wzG/+NDPWtm2rJBiL/BYS3n2MCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-08T20:12:15.550760Z"},"content_sha256":"7c261c1feab02feb22a5e24db796ede24cf7c99aae1843c4ea0ad7c95d69935d","schema_version":"1.0","event_id":"sha256:7c261c1feab02feb22a5e24db796ede24cf7c99aae1843c4ea0ad7c95d69935d"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2011:KBATRQHUFWSUBKJMT3MNZPCPSY","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Singular perturbation analysis of a reduced model for collective motion: A renormalization group approach","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.bio-ph"],"primary_cat":"cond-mat.soft","authors_text":"Chiu Fan Lee","submitted_at":"2011-02-02T11:50:54Z","abstract_excerpt":"In a system of noisy self-propelled particles with interactions that favor directional alignment, collective motion will appear if the density of particles is beyond a critical density. Starting with a reduced model for collective motion, we determine how the critical density depends on the form of the initial perturbation. Specifically, we employ a renormalization-group improved perturbative method to analyze the model equations, and show analytically, up to first order in the perturbation parameter, how the critical density is modified by the strength of the initial angular perturbation in t"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1102.0407","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":"2026-05-18T04:26:12Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"6HIGLQoipxMSJ8yI35wJOMiEs1qvqtKDFtbCrGYwRIhi/GRi8FipoiC/I8beYGJ4SSCcnBOtrRT8qV97t7NLBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-08T20:12:15.551497Z"},"content_sha256":"06387765d021d086b0a8d8e406e32e1dcd7a18758296eb65363b3182fd645216","schema_version":"1.0","event_id":"sha256:06387765d021d086b0a8d8e406e32e1dcd7a18758296eb65363b3182fd645216"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/KBATRQHUFWSUBKJMT3MNZPCPSY/bundle.json","state_url":"https://pith.science/pith/KBATRQHUFWSUBKJMT3MNZPCPSY/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/KBATRQHUFWSUBKJMT3MNZPCPSY/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":"2026-06-08T20:12:15Z","links":{"resolver":"https://pith.science/pith/KBATRQHUFWSUBKJMT3MNZPCPSY","bundle":"https://pith.science/pith/KBATRQHUFWSUBKJMT3MNZPCPSY/bundle.json","state":"https://pith.science/pith/KBATRQHUFWSUBKJMT3MNZPCPSY/state.json","well_known_bundle":"https://pith.science/.well-known/pith/KBATRQHUFWSUBKJMT3MNZPCPSY/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:KBATRQHUFWSUBKJMT3MNZPCPSY","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":"7aeb00e2e2a9dd6ed93864aa278fd1d2e696adf6e3573cca0176994aea1db7b0","cross_cats_sorted":["physics.bio-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.soft","submitted_at":"2011-02-02T11:50:54Z","title_canon_sha256":"16445e239898816e4ad80e08ff333f087fe52e43d784edd78d68dde694e86ed0"},"schema_version":"1.0","source":{"id":"1102.0407","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1102.0407","created_at":"2026-05-18T04:26:12Z"},{"alias_kind":"arxiv_version","alias_value":"1102.0407v1","created_at":"2026-05-18T04:26:12Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1102.0407","created_at":"2026-05-18T04:26:12Z"},{"alias_kind":"pith_short_12","alias_value":"KBATRQHUFWSU","created_at":"2026-05-18T12:26:32Z"},{"alias_kind":"pith_short_16","alias_value":"KBATRQHUFWSUBKJM","created_at":"2026-05-18T12:26:32Z"},{"alias_kind":"pith_short_8","alias_value":"KBATRQHU","created_at":"2026-05-18T12:26:32Z"}],"graph_snapshots":[{"event_id":"sha256:06387765d021d086b0a8d8e406e32e1dcd7a18758296eb65363b3182fd645216","target":"graph","created_at":"2026-05-18T04:26:12Z","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":"In a system of noisy self-propelled particles with interactions that favor directional alignment, collective motion will appear if the density of particles is beyond a critical density. Starting with a reduced model for collective motion, we determine how the critical density depends on the form of the initial perturbation. Specifically, we employ a renormalization-group improved perturbative method to analyze the model equations, and show analytically, up to first order in the perturbation parameter, how the critical density is modified by the strength of the initial angular perturbation in t","authors_text":"Chiu Fan Lee","cross_cats":["physics.bio-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.soft","submitted_at":"2011-02-02T11:50:54Z","title":"Singular perturbation analysis of a reduced model for collective motion: A renormalization group approach"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1102.0407","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":"sha256:7c261c1feab02feb22a5e24db796ede24cf7c99aae1843c4ea0ad7c95d69935d","target":"record","created_at":"2026-05-18T04:26:12Z","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":"7aeb00e2e2a9dd6ed93864aa278fd1d2e696adf6e3573cca0176994aea1db7b0","cross_cats_sorted":["physics.bio-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.soft","submitted_at":"2011-02-02T11:50:54Z","title_canon_sha256":"16445e239898816e4ad80e08ff333f087fe52e43d784edd78d68dde694e86ed0"},"schema_version":"1.0","source":{"id":"1102.0407","kind":"arxiv","version":1}},"canonical_sha256":"504138c0f42da540a92c9ed8dcbc4f962300609263a05a124cf253467d16d21f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"504138c0f42da540a92c9ed8dcbc4f962300609263a05a124cf253467d16d21f","first_computed_at":"2026-05-18T04:26:12.767011Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:26:12.767011Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Tfg9hLVFOH9RuMWh8aqWPJQ5crzzCtaLHdSqxBVN6BjYlLArjSxtGb36GyS5Qv0pjlIUk78UTiIyD/RftHjqDg==","signature_status":"signed_v1","signed_at":"2026-05-18T04:26:12.767781Z","signed_message":"canonical_sha256_bytes"},"source_id":"1102.0407","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:7c261c1feab02feb22a5e24db796ede24cf7c99aae1843c4ea0ad7c95d69935d","sha256:06387765d021d086b0a8d8e406e32e1dcd7a18758296eb65363b3182fd645216"],"state_sha256":"278afe51d4db88b75de04c1122de02dea24f49c46f029b791957008554985d1e"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"GqHkWaUINTKcCpL/abnZg8Wqufm7Bzch7OaJqWuFbPcLk+6v3T3xW6r6cpNBcmyEv5WLQO8YLbUmo/h9NBP1CQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-08T20:12:15.556050Z","bundle_sha256":"49c44b302befe185bb19ad3ccd2224451e0ee75dc2e5434a5c3b3f5b40b93aff"}}