{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:CK3JNIVQL3PQZKGVBISI63ENXD","short_pith_number":"pith:CK3JNIVQ","canonical_record":{"source":{"id":"1508.04673","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.soft","submitted_at":"2015-08-19T15:08:56Z","cross_cats_sorted":["nlin.PS"],"title_canon_sha256":"a75acaf5afb797e1af93aa1815b2e1281203937b340c401b6906557e880af34b","abstract_canon_sha256":"54567e920964f13a5d0d7dfd01c9d8e570d0f5802217351cef757edb394b123f"},"schema_version":"1.0"},"canonical_sha256":"12b696a2b05edf0ca8d50a248f6c8db8c84193a2a9f176e52451cce1acf44493","source":{"kind":"arxiv","id":"1508.04673","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1508.04673","created_at":"2026-05-18T01:08:32Z"},{"alias_kind":"arxiv_version","alias_value":"1508.04673v2","created_at":"2026-05-18T01:08:32Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1508.04673","created_at":"2026-05-18T01:08:32Z"},{"alias_kind":"pith_short_12","alias_value":"CK3JNIVQL3PQ","created_at":"2026-05-18T12:29:14Z"},{"alias_kind":"pith_short_16","alias_value":"CK3JNIVQL3PQZKGV","created_at":"2026-05-18T12:29:14Z"},{"alias_kind":"pith_short_8","alias_value":"CK3JNIVQ","created_at":"2026-05-18T12:29:14Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:CK3JNIVQL3PQZKGVBISI63ENXD","target":"record","payload":{"canonical_record":{"source":{"id":"1508.04673","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.soft","submitted_at":"2015-08-19T15:08:56Z","cross_cats_sorted":["nlin.PS"],"title_canon_sha256":"a75acaf5afb797e1af93aa1815b2e1281203937b340c401b6906557e880af34b","abstract_canon_sha256":"54567e920964f13a5d0d7dfd01c9d8e570d0f5802217351cef757edb394b123f"},"schema_version":"1.0"},"canonical_sha256":"12b696a2b05edf0ca8d50a248f6c8db8c84193a2a9f176e52451cce1acf44493","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:08:32.502759Z","signature_b64":"3lT6v1zkCsInpoAn344AQL+H6qyHR57Yppf6KsJvKMDbJji581P+AwQss90zuHgJYVRMuwLZgk5rxhtSmiupAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"12b696a2b05edf0ca8d50a248f6c8db8c84193a2a9f176e52451cce1acf44493","last_reissued_at":"2026-05-18T01:08:32.502129Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:08:32.502129Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1508.04673","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":"2026-05-18T01:08:32Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"9rIq54rF/q/YdqyFReNBTmJmEodEUIXcYKV5IMGViasgXfMcM3nR1zFs1RRE8P3dW7bcF55FE4sAubV8cKBWDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T14:13:30.767738Z"},"content_sha256":"7ccab79f10adb8745e3e759aa0df81562ec0aae78034dc081fbc358f4e850dae","schema_version":"1.0","event_id":"sha256:7ccab79f10adb8745e3e759aa0df81562ec0aae78034dc081fbc358f4e850dae"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:CK3JNIVQL3PQZKGVBISI63ENXD","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Clustering and pattern formation in chemorepulsive active colloids","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["nlin.PS"],"primary_cat":"cond-mat.soft","authors_text":"Benno Liebchen, Davide Marenduzzo, Ignacio Pagonabarraga, Michael E. Cates","submitted_at":"2015-08-19T15:08:56Z","abstract_excerpt":"We demonstrate that migration away from self-produced chemicals (chemorepulsion) generates a generic route to clustering and pattern formation among self-propelled colloids. The clustering instability can be caused either by anisotropic chemical production, or by a delayed orientational response to changes of the chemical environment. In each case, chemorepulsion creates clusters of a self-limiting area which grows linearly with self-propulsion speed. This agrees with recent observations of dynamic clusters in Janus colloids (albeit not yet known to be chemorepulsive). More generally, our resu"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1508.04673","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":"2026-05-18T01:08:32Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"mwIrfCuxWjqgMIdTfsOUDwpSkqG1O4mGh1bFva2jVKxqoylAeMmRQhrt+xqyjXOshJQb8XI1xPoaxfP6F6kDAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T14:13:30.768330Z"},"content_sha256":"ddf64e09fd7adc6c029fbb91e068ca8966411a0947acbbbab6f9a6db9ecff77e","schema_version":"1.0","event_id":"sha256:ddf64e09fd7adc6c029fbb91e068ca8966411a0947acbbbab6f9a6db9ecff77e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/CK3JNIVQL3PQZKGVBISI63ENXD/bundle.json","state_url":"https://pith.science/pith/CK3JNIVQL3PQZKGVBISI63ENXD/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/CK3JNIVQL3PQZKGVBISI63ENXD/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":"2026-05-26T14:13:30Z","links":{"resolver":"https://pith.science/pith/CK3JNIVQL3PQZKGVBISI63ENXD","bundle":"https://pith.science/pith/CK3JNIVQL3PQZKGVBISI63ENXD/bundle.json","state":"https://pith.science/pith/CK3JNIVQL3PQZKGVBISI63ENXD/state.json","well_known_bundle":"https://pith.science/.well-known/pith/CK3JNIVQL3PQZKGVBISI63ENXD/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:CK3JNIVQL3PQZKGVBISI63ENXD","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":"54567e920964f13a5d0d7dfd01c9d8e570d0f5802217351cef757edb394b123f","cross_cats_sorted":["nlin.PS"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.soft","submitted_at":"2015-08-19T15:08:56Z","title_canon_sha256":"a75acaf5afb797e1af93aa1815b2e1281203937b340c401b6906557e880af34b"},"schema_version":"1.0","source":{"id":"1508.04673","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1508.04673","created_at":"2026-05-18T01:08:32Z"},{"alias_kind":"arxiv_version","alias_value":"1508.04673v2","created_at":"2026-05-18T01:08:32Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1508.04673","created_at":"2026-05-18T01:08:32Z"},{"alias_kind":"pith_short_12","alias_value":"CK3JNIVQL3PQ","created_at":"2026-05-18T12:29:14Z"},{"alias_kind":"pith_short_16","alias_value":"CK3JNIVQL3PQZKGV","created_at":"2026-05-18T12:29:14Z"},{"alias_kind":"pith_short_8","alias_value":"CK3JNIVQ","created_at":"2026-05-18T12:29:14Z"}],"graph_snapshots":[{"event_id":"sha256:ddf64e09fd7adc6c029fbb91e068ca8966411a0947acbbbab6f9a6db9ecff77e","target":"graph","created_at":"2026-05-18T01:08:32Z","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 demonstrate that migration away from self-produced chemicals (chemorepulsion) generates a generic route to clustering and pattern formation among self-propelled colloids. The clustering instability can be caused either by anisotropic chemical production, or by a delayed orientational response to changes of the chemical environment. In each case, chemorepulsion creates clusters of a self-limiting area which grows linearly with self-propulsion speed. This agrees with recent observations of dynamic clusters in Janus colloids (albeit not yet known to be chemorepulsive). More generally, our resu","authors_text":"Benno Liebchen, Davide Marenduzzo, Ignacio Pagonabarraga, Michael E. Cates","cross_cats":["nlin.PS"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.soft","submitted_at":"2015-08-19T15:08:56Z","title":"Clustering and pattern formation in chemorepulsive active colloids"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1508.04673","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":"sha256:7ccab79f10adb8745e3e759aa0df81562ec0aae78034dc081fbc358f4e850dae","target":"record","created_at":"2026-05-18T01:08:32Z","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":"54567e920964f13a5d0d7dfd01c9d8e570d0f5802217351cef757edb394b123f","cross_cats_sorted":["nlin.PS"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.soft","submitted_at":"2015-08-19T15:08:56Z","title_canon_sha256":"a75acaf5afb797e1af93aa1815b2e1281203937b340c401b6906557e880af34b"},"schema_version":"1.0","source":{"id":"1508.04673","kind":"arxiv","version":2}},"canonical_sha256":"12b696a2b05edf0ca8d50a248f6c8db8c84193a2a9f176e52451cce1acf44493","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"12b696a2b05edf0ca8d50a248f6c8db8c84193a2a9f176e52451cce1acf44493","first_computed_at":"2026-05-18T01:08:32.502129Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:08:32.502129Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"3lT6v1zkCsInpoAn344AQL+H6qyHR57Yppf6KsJvKMDbJji581P+AwQss90zuHgJYVRMuwLZgk5rxhtSmiupAg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:08:32.502759Z","signed_message":"canonical_sha256_bytes"},"source_id":"1508.04673","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:7ccab79f10adb8745e3e759aa0df81562ec0aae78034dc081fbc358f4e850dae","sha256:ddf64e09fd7adc6c029fbb91e068ca8966411a0947acbbbab6f9a6db9ecff77e"],"state_sha256":"a3d190f5c83435010b956597859ebab03be4eed44c0f82038cb2bda81bf1b12e"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"X67ZZbTBcL4D/IVhSRh0kBzv/rIHcZJ+cfXf1Sd1HbFV0d3kl0vGJ1H/o7tMu1lBiFiO3y2+0Ep1eQ3U1ZAGAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T14:13:30.771361Z","bundle_sha256":"32dd9d4126f7dce7e48c527367666028f2906437a17c553fd0f9c69b3d78c96f"}}