{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:73UD5ZQ6LBUX7N2WWWKZMQSHQ3","short_pith_number":"pith:73UD5ZQ6","canonical_record":{"source":{"id":"1912.04621","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2019-12-10T10:30:41Z","cross_cats_sorted":["cond-mat.soft","physics.bio-ph","physics.chem-ph"],"title_canon_sha256":"2039919ab2e4cf870d1d2df618ba93de299ad58a58b1c6bb5d563e9cd0c4df81","abstract_canon_sha256":"f9e5c3e79ac8de795a245e6af8b1b923a73b8d030d5d31192b35ba31abef7854"},"schema_version":"1.0"},"canonical_sha256":"fee83ee61e58697fb756b59596424786d22c12e17cbf7fd0feeac0a08bd4032c","source":{"kind":"arxiv","id":"1912.04621","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1912.04621","created_at":"2026-07-05T00:33:24Z"},{"alias_kind":"arxiv_version","alias_value":"1912.04621v1","created_at":"2026-07-05T00:33:24Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1912.04621","created_at":"2026-07-05T00:33:24Z"},{"alias_kind":"pith_short_12","alias_value":"73UD5ZQ6LBUX","created_at":"2026-07-05T00:33:24Z"},{"alias_kind":"pith_short_16","alias_value":"73UD5ZQ6LBUX7N2W","created_at":"2026-07-05T00:33:24Z"},{"alias_kind":"pith_short_8","alias_value":"73UD5ZQ6","created_at":"2026-07-05T00:33:24Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:73UD5ZQ6LBUX7N2WWWKZMQSHQ3","target":"record","payload":{"canonical_record":{"source":{"id":"1912.04621","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2019-12-10T10:30:41Z","cross_cats_sorted":["cond-mat.soft","physics.bio-ph","physics.chem-ph"],"title_canon_sha256":"2039919ab2e4cf870d1d2df618ba93de299ad58a58b1c6bb5d563e9cd0c4df81","abstract_canon_sha256":"f9e5c3e79ac8de795a245e6af8b1b923a73b8d030d5d31192b35ba31abef7854"},"schema_version":"1.0"},"canonical_sha256":"fee83ee61e58697fb756b59596424786d22c12e17cbf7fd0feeac0a08bd4032c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T00:33:24.495956Z","signature_b64":"MMfVrFZ4a4N8d8n9JpBoC8Md4yfkn6Yy9/fXNAJxxrl7EnR46PFV8W0S5ProIBcfLImhAMBaZx2OcnlkTMvKCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"fee83ee61e58697fb756b59596424786d22c12e17cbf7fd0feeac0a08bd4032c","last_reissued_at":"2026-07-05T00:33:24.495417Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T00:33:24.495417Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1912.04621","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":"2026-07-05T00:33:24Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"LTuGYl4ZP+TCfZSKZlDKhPjeW3eiEXNhE7dQhjfmvR5Nd7U01RWw0HX+mb07IO3PHZkd2omP7J7wxET5yZOQAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-05T03:25:49.977725Z"},"content_sha256":"0f194df733f51bd114eebffa24bf8a840044299a1f4861968f9b20d2206d1afd","schema_version":"1.0","event_id":"sha256:0f194df733f51bd114eebffa24bf8a840044299a1f4861968f9b20d2206d1afd"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:73UD5ZQ6LBUX7N2WWWKZMQSHQ3","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Collisions and rebounds of chemically-active droplets","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.soft","physics.bio-ph","physics.chem-ph"],"primary_cat":"physics.flu-dyn","authors_text":"Kevin Lippera, Matvey Morozov, Michael Benzaquen, S\\'ebastien Michelin","submitted_at":"2019-12-10T10:30:41Z","abstract_excerpt":"Active droplets swim as a result of the nonlinear advective coupling of the distribution of chemical species they consume or release with the Marangoni flows created by their non-uniform surface distribution. Most existing models focus on the self-propulsion of a single droplet in an unbounded fluid, which arises when diffusion is slow enough (i.e. beyond a critical P\\'eclet number, $\\mbox{Pe}_c$). Despite its experimental relevance, the coupled dynamics of multiple droplets and/or collision with a wall remains mostly unexplored. Using a novel approach based on a moving fitted bispherical grid"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1912.04621","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/1912.04621/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T00:33:24Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"sxtAemwsQSXMRZfvjgNNrlMx2KxCSMvbuHGM5t/IFmY8LC8+84GWk2uekzp1fxXCkfGYVJ4daNw8UQP66RHYAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-05T03:25:49.978252Z"},"content_sha256":"a89160452cda2c1eb69d295a8c10169b0a157525b3fa7ed1cb1125563ff193cb","schema_version":"1.0","event_id":"sha256:a89160452cda2c1eb69d295a8c10169b0a157525b3fa7ed1cb1125563ff193cb"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/73UD5ZQ6LBUX7N2WWWKZMQSHQ3/bundle.json","state_url":"https://pith.science/pith/73UD5ZQ6LBUX7N2WWWKZMQSHQ3/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/73UD5ZQ6LBUX7N2WWWKZMQSHQ3/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":"2026-08-05T03:25:49Z","links":{"resolver":"https://pith.science/pith/73UD5ZQ6LBUX7N2WWWKZMQSHQ3","bundle":"https://pith.science/pith/73UD5ZQ6LBUX7N2WWWKZMQSHQ3/bundle.json","state":"https://pith.science/pith/73UD5ZQ6LBUX7N2WWWKZMQSHQ3/state.json","well_known_bundle":"https://pith.science/.well-known/pith/73UD5ZQ6LBUX7N2WWWKZMQSHQ3/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:73UD5ZQ6LBUX7N2WWWKZMQSHQ3","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":"f9e5c3e79ac8de795a245e6af8b1b923a73b8d030d5d31192b35ba31abef7854","cross_cats_sorted":["cond-mat.soft","physics.bio-ph","physics.chem-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2019-12-10T10:30:41Z","title_canon_sha256":"2039919ab2e4cf870d1d2df618ba93de299ad58a58b1c6bb5d563e9cd0c4df81"},"schema_version":"1.0","source":{"id":"1912.04621","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1912.04621","created_at":"2026-07-05T00:33:24Z"},{"alias_kind":"arxiv_version","alias_value":"1912.04621v1","created_at":"2026-07-05T00:33:24Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1912.04621","created_at":"2026-07-05T00:33:24Z"},{"alias_kind":"pith_short_12","alias_value":"73UD5ZQ6LBUX","created_at":"2026-07-05T00:33:24Z"},{"alias_kind":"pith_short_16","alias_value":"73UD5ZQ6LBUX7N2W","created_at":"2026-07-05T00:33:24Z"},{"alias_kind":"pith_short_8","alias_value":"73UD5ZQ6","created_at":"2026-07-05T00:33:24Z"}],"graph_snapshots":[{"event_id":"sha256:a89160452cda2c1eb69d295a8c10169b0a157525b3fa7ed1cb1125563ff193cb","target":"graph","created_at":"2026-07-05T00:33:24Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/1912.04621/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Active droplets swim as a result of the nonlinear advective coupling of the distribution of chemical species they consume or release with the Marangoni flows created by their non-uniform surface distribution. Most existing models focus on the self-propulsion of a single droplet in an unbounded fluid, which arises when diffusion is slow enough (i.e. beyond a critical P\\'eclet number, $\\mbox{Pe}_c$). Despite its experimental relevance, the coupled dynamics of multiple droplets and/or collision with a wall remains mostly unexplored. Using a novel approach based on a moving fitted bispherical grid","authors_text":"Kevin Lippera, Matvey Morozov, Michael Benzaquen, S\\'ebastien Michelin","cross_cats":["cond-mat.soft","physics.bio-ph","physics.chem-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2019-12-10T10:30:41Z","title":"Collisions and rebounds of chemically-active droplets"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1912.04621","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":"sha256:0f194df733f51bd114eebffa24bf8a840044299a1f4861968f9b20d2206d1afd","target":"record","created_at":"2026-07-05T00:33:24Z","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":"f9e5c3e79ac8de795a245e6af8b1b923a73b8d030d5d31192b35ba31abef7854","cross_cats_sorted":["cond-mat.soft","physics.bio-ph","physics.chem-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2019-12-10T10:30:41Z","title_canon_sha256":"2039919ab2e4cf870d1d2df618ba93de299ad58a58b1c6bb5d563e9cd0c4df81"},"schema_version":"1.0","source":{"id":"1912.04621","kind":"arxiv","version":1}},"canonical_sha256":"fee83ee61e58697fb756b59596424786d22c12e17cbf7fd0feeac0a08bd4032c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"fee83ee61e58697fb756b59596424786d22c12e17cbf7fd0feeac0a08bd4032c","first_computed_at":"2026-07-05T00:33:24.495417Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T00:33:24.495417Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"MMfVrFZ4a4N8d8n9JpBoC8Md4yfkn6Yy9/fXNAJxxrl7EnR46PFV8W0S5ProIBcfLImhAMBaZx2OcnlkTMvKCw==","signature_status":"signed_v1","signed_at":"2026-07-05T00:33:24.495956Z","signed_message":"canonical_sha256_bytes"},"source_id":"1912.04621","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:0f194df733f51bd114eebffa24bf8a840044299a1f4861968f9b20d2206d1afd","sha256:a89160452cda2c1eb69d295a8c10169b0a157525b3fa7ed1cb1125563ff193cb"],"state_sha256":"4478f497a08427c578696bba95fa9bf4adfaba8b41fb73f0062ead563b69e10d"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/Jq3s+NODxrAQLP5t8D1qVGXVNIcCGfShkXNMLvkhRFZ+E8R6v2hJDcA6VES1zWDvAFzSuFVk8UG7WhZvT1SCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-05T03:25:49.983445Z","bundle_sha256":"d97774bc459ee05980ce315cd08ea747dc3658ea462efd84200f20c687c4ed26"}}