{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2014:RQGYGDYYWRCBEPHD7HHU2V5ZOV","short_pith_number":"pith:RQGYGDYY","canonical_record":{"source":{"id":"1407.8516","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.soft","submitted_at":"2014-07-31T18:29:00Z","cross_cats_sorted":[],"title_canon_sha256":"dc74c97442330fafa3d4c68bc3a4281ee62161b663bbabcace3078d625e434e7","abstract_canon_sha256":"979f1311991ffd1b669e07a7f089779fa1569488713e9c03355cc263247db0c3"},"schema_version":"1.0"},"canonical_sha256":"8c0d830f18b444123ce3f9cf4d57b9756f90c423dec3eb61c53e27443004a8d1","source":{"kind":"arxiv","id":"1407.8516","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1407.8516","created_at":"2026-05-18T02:25:47Z"},{"alias_kind":"arxiv_version","alias_value":"1407.8516v1","created_at":"2026-05-18T02:25:47Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1407.8516","created_at":"2026-05-18T02:25:47Z"},{"alias_kind":"pith_short_12","alias_value":"RQGYGDYYWRCB","created_at":"2026-05-18T12:28:46Z"},{"alias_kind":"pith_short_16","alias_value":"RQGYGDYYWRCBEPHD","created_at":"2026-05-18T12:28:46Z"},{"alias_kind":"pith_short_8","alias_value":"RQGYGDYY","created_at":"2026-05-18T12:28:46Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2014:RQGYGDYYWRCBEPHD7HHU2V5ZOV","target":"record","payload":{"canonical_record":{"source":{"id":"1407.8516","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.soft","submitted_at":"2014-07-31T18:29:00Z","cross_cats_sorted":[],"title_canon_sha256":"dc74c97442330fafa3d4c68bc3a4281ee62161b663bbabcace3078d625e434e7","abstract_canon_sha256":"979f1311991ffd1b669e07a7f089779fa1569488713e9c03355cc263247db0c3"},"schema_version":"1.0"},"canonical_sha256":"8c0d830f18b444123ce3f9cf4d57b9756f90c423dec3eb61c53e27443004a8d1","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:25:47.062023Z","signature_b64":"ca5Xq1AbiyvoGz/J+6YNfODENotihmULNnFH2Seg2mkqJfeNwOA6IOg2r4bQbK4l0aEAfHZaPUXins77FCSKCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"8c0d830f18b444123ce3f9cf4d57b9756f90c423dec3eb61c53e27443004a8d1","last_reissued_at":"2026-05-18T02:25:47.061529Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:25:47.061529Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1407.8516","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":"2026-05-18T02:25:47Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"a4Z3GN+1SgvvUwbhAe0DgyRPwvN7U7e+nc+k4qKYt7l33FXu1Xy/SNQpR6n67OPianHSWUAakMFr7l6u23pzDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-08T01:34:24.526779Z"},"content_sha256":"9e3eb8a6e929251e7bfd7688621fb331a37a4f348795b457e980aeb2dca89dd6","schema_version":"1.0","event_id":"sha256:9e3eb8a6e929251e7bfd7688621fb331a37a4f348795b457e980aeb2dca89dd6"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2014:RQGYGDYYWRCBEPHD7HHU2V5ZOV","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Active swarms on a sphere","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.soft","authors_text":"Rastko Sknepnek, Silke Henkes","submitted_at":"2014-07-31T18:29:00Z","abstract_excerpt":"Here we show that coupling to curvature has profound effects on collective motion in active systems, leading to patterns not observed in flat space. Biological examples of such active motion in curved environments are numerous: curvature and tissue folding are crucial during gastrulation, epithelial and endothelial cells move on constantly growing, curved crypts and vili in the gut, and the mammalian corneal epithelium grows in a steady-state vortex pattern. On the physics side, droplets coated with actively driven microtubule bundles show active nematic patterns. We study a model of self-prop"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1407.8516","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":"2026-05-18T02:25:47Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"bSMVnkBrFJaGGsajUvT5mkvUXM0LB5R05ugIlclpq6qY5Bft31i6WD2NAINhRX1rhjZ/ovGyX6WYjmtG+g11Cg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-08T01:34:24.527474Z"},"content_sha256":"dc2115be9837edd0b0d86a04ff94e4cee859a1de5370b485aca58ad2bfccfc7e","schema_version":"1.0","event_id":"sha256:dc2115be9837edd0b0d86a04ff94e4cee859a1de5370b485aca58ad2bfccfc7e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/RQGYGDYYWRCBEPHD7HHU2V5ZOV/bundle.json","state_url":"https://pith.science/pith/RQGYGDYYWRCBEPHD7HHU2V5ZOV/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/RQGYGDYYWRCBEPHD7HHU2V5ZOV/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":"2026-06-08T01:34:24Z","links":{"resolver":"https://pith.science/pith/RQGYGDYYWRCBEPHD7HHU2V5ZOV","bundle":"https://pith.science/pith/RQGYGDYYWRCBEPHD7HHU2V5ZOV/bundle.json","state":"https://pith.science/pith/RQGYGDYYWRCBEPHD7HHU2V5ZOV/state.json","well_known_bundle":"https://pith.science/.well-known/pith/RQGYGDYYWRCBEPHD7HHU2V5ZOV/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:RQGYGDYYWRCBEPHD7HHU2V5ZOV","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":"979f1311991ffd1b669e07a7f089779fa1569488713e9c03355cc263247db0c3","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.soft","submitted_at":"2014-07-31T18:29:00Z","title_canon_sha256":"dc74c97442330fafa3d4c68bc3a4281ee62161b663bbabcace3078d625e434e7"},"schema_version":"1.0","source":{"id":"1407.8516","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1407.8516","created_at":"2026-05-18T02:25:47Z"},{"alias_kind":"arxiv_version","alias_value":"1407.8516v1","created_at":"2026-05-18T02:25:47Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1407.8516","created_at":"2026-05-18T02:25:47Z"},{"alias_kind":"pith_short_12","alias_value":"RQGYGDYYWRCB","created_at":"2026-05-18T12:28:46Z"},{"alias_kind":"pith_short_16","alias_value":"RQGYGDYYWRCBEPHD","created_at":"2026-05-18T12:28:46Z"},{"alias_kind":"pith_short_8","alias_value":"RQGYGDYY","created_at":"2026-05-18T12:28:46Z"}],"graph_snapshots":[{"event_id":"sha256:dc2115be9837edd0b0d86a04ff94e4cee859a1de5370b485aca58ad2bfccfc7e","target":"graph","created_at":"2026-05-18T02:25:47Z","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":"Here we show that coupling to curvature has profound effects on collective motion in active systems, leading to patterns not observed in flat space. Biological examples of such active motion in curved environments are numerous: curvature and tissue folding are crucial during gastrulation, epithelial and endothelial cells move on constantly growing, curved crypts and vili in the gut, and the mammalian corneal epithelium grows in a steady-state vortex pattern. On the physics side, droplets coated with actively driven microtubule bundles show active nematic patterns. We study a model of self-prop","authors_text":"Rastko Sknepnek, Silke Henkes","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.soft","submitted_at":"2014-07-31T18:29:00Z","title":"Active swarms on a sphere"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1407.8516","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":"sha256:9e3eb8a6e929251e7bfd7688621fb331a37a4f348795b457e980aeb2dca89dd6","target":"record","created_at":"2026-05-18T02:25:47Z","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":"979f1311991ffd1b669e07a7f089779fa1569488713e9c03355cc263247db0c3","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.soft","submitted_at":"2014-07-31T18:29:00Z","title_canon_sha256":"dc74c97442330fafa3d4c68bc3a4281ee62161b663bbabcace3078d625e434e7"},"schema_version":"1.0","source":{"id":"1407.8516","kind":"arxiv","version":1}},"canonical_sha256":"8c0d830f18b444123ce3f9cf4d57b9756f90c423dec3eb61c53e27443004a8d1","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"8c0d830f18b444123ce3f9cf4d57b9756f90c423dec3eb61c53e27443004a8d1","first_computed_at":"2026-05-18T02:25:47.061529Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:25:47.061529Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ca5Xq1AbiyvoGz/J+6YNfODENotihmULNnFH2Seg2mkqJfeNwOA6IOg2r4bQbK4l0aEAfHZaPUXins77FCSKCg==","signature_status":"signed_v1","signed_at":"2026-05-18T02:25:47.062023Z","signed_message":"canonical_sha256_bytes"},"source_id":"1407.8516","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9e3eb8a6e929251e7bfd7688621fb331a37a4f348795b457e980aeb2dca89dd6","sha256:dc2115be9837edd0b0d86a04ff94e4cee859a1de5370b485aca58ad2bfccfc7e"],"state_sha256":"1244d6c94b97c0f96d207db9c3a86e0c54ef165d10454d32a741999a4d7ad685"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"YfM6ThI/NNmGGvgIUw2naATiPNcebDoM6MOLneK420RNiNs/9lReZxGDcHGDbgTj5DkhAkSUFjEMvy3EFgS/Cg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-08T01:34:24.531141Z","bundle_sha256":"cb8d09ca1d1500b1e872f47c7b77bda707a9899af32f0a438f78c5abad9afd36"}}