{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:ZVGHTB5A33CEA6NAQAI2RJAFGW","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":"6a8805ca7e61c9653ee6e48bb9108177837dab636b2e0274bda5386fb2c0a412","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2016-04-04T09:47:47Z","title_canon_sha256":"4cf22a97048b8d6df0bd41243d9bef0975a473539c8941e12a3687b62c9bb7c4"},"schema_version":"1.0","source":{"id":"1604.00791","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1604.00791","created_at":"2026-05-18T01:11:44Z"},{"alias_kind":"arxiv_version","alias_value":"1604.00791v1","created_at":"2026-05-18T01:11:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1604.00791","created_at":"2026-05-18T01:11:44Z"},{"alias_kind":"pith_short_12","alias_value":"ZVGHTB5A33CE","created_at":"2026-05-18T12:30:55Z"},{"alias_kind":"pith_short_16","alias_value":"ZVGHTB5A33CEA6NA","created_at":"2026-05-18T12:30:55Z"},{"alias_kind":"pith_short_8","alias_value":"ZVGHTB5A","created_at":"2026-05-18T12:30:55Z"}],"graph_snapshots":[{"event_id":"sha256:a218f14e958cd208f6056898623b8b44f536d43f1995c4ac7d5a40f5a302dda9","target":"graph","created_at":"2026-05-18T01:11:44Z","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 behaviour of sedimenting particles depends on the dust-to-gas ratio of the fluid. Linear stability analysis shows that solids settling in the Epstein drag regime would remain homogeneously distributed in non-rotating incompressible fluids, even when dust-to-gas ratios reach unity. However, the non-linear evolution has not been probed before. Here, we present numerical calculations indicating that in a particle-dense mixture solids spontaneously mix out of the fluid and form swarms overdense in particles by at least a factor 10. The instability is caused by mass-loaded regions locally break","authors_text":"Anders Johansen, Eberhard Bodenschatz, Holly L. Capelo, J\\\"urgen Blum, Michiel Lambrechts","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2016-04-04T09:47:47Z","title":"Spontaneous concentrations of solids through two-way drag forces between gas and sedimenting particles"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1604.00791","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":"sha256:4f9b28bce4331fd2d737673ea9aaaed0df536e512f80e664e63544048433480b","target":"record","created_at":"2026-05-18T01:11:44Z","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":"6a8805ca7e61c9653ee6e48bb9108177837dab636b2e0274bda5386fb2c0a412","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2016-04-04T09:47:47Z","title_canon_sha256":"4cf22a97048b8d6df0bd41243d9bef0975a473539c8941e12a3687b62c9bb7c4"},"schema_version":"1.0","source":{"id":"1604.00791","kind":"arxiv","version":1}},"canonical_sha256":"cd4c7987a0dec44079a08011a8a40535a4c08715b90a80bf5574e1398b7d1900","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"cd4c7987a0dec44079a08011a8a40535a4c08715b90a80bf5574e1398b7d1900","first_computed_at":"2026-05-18T01:11:44.585643Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:11:44.585643Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"QPB2ugwkbnIPXlodxSopHT1x7V92xHrLm8caHOXDrykXbwikQn2RE6lIk3j7IjUPbuvLtS8TFPPRiND3CdGwAw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:11:44.585987Z","signed_message":"canonical_sha256_bytes"},"source_id":"1604.00791","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:4f9b28bce4331fd2d737673ea9aaaed0df536e512f80e664e63544048433480b","sha256:a218f14e958cd208f6056898623b8b44f536d43f1995c4ac7d5a40f5a302dda9"],"state_sha256":"9e40eae59f1365bf9bbe7598bb12d5204ff27247189ba2215b414676835d87ac"}