{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:TZG7FUH23IDGWX5TMED6ADJEVB","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":"c9aebb87eb963c8444fae9e9a1373e63e24ce3b4dda1aa98c87144ace5209b28","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.soft","submitted_at":"2012-04-30T14:50:14Z","title_canon_sha256":"25e2df20ca2d58c77beede9bac7c75c8e2f9c5953b7f3f43e913799ee5387e6d"},"schema_version":"1.0","source":{"id":"1204.6654","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1204.6654","created_at":"2026-05-18T03:56:44Z"},{"alias_kind":"arxiv_version","alias_value":"1204.6654v1","created_at":"2026-05-18T03:56:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1204.6654","created_at":"2026-05-18T03:56:44Z"},{"alias_kind":"pith_short_12","alias_value":"TZG7FUH23IDG","created_at":"2026-05-18T12:27:23Z"},{"alias_kind":"pith_short_16","alias_value":"TZG7FUH23IDGWX5T","created_at":"2026-05-18T12:27:23Z"},{"alias_kind":"pith_short_8","alias_value":"TZG7FUH2","created_at":"2026-05-18T12:27:23Z"}],"graph_snapshots":[{"event_id":"sha256:dc2291bab20b81b9d288ab99df0f8587b19b26e75d0b388f485db72dc3060e29","target":"graph","created_at":"2026-05-18T03:56:44Z","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":"We study the geometrically induced cohesion of ensembles of granular \"u-particles\" which mechanically entangle through particle interpenetration. We vary the length-to-width ratio $l/w$ of the u-particles and form them into free-standing vertical columns. In laboratory experiment we monitor the response of the columns to sinusoidal vibration (frequency $f$, peak acceleration $\\Gamma$). Column collapse occurs in a characteristic time, $\\tau$, which follows the relation $\\tau = f^{-1} \\exp(\\Delta / \\Gamma)$. $\\Delta$ resembles an activation energy and is maximal at intermediate $l/w$. Simulation","authors_text":"Daniel I. Goldman, David L. Hu, Nick Gravish, Scott V. Franklin","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.soft","submitted_at":"2012-04-30T14:50:14Z","title":"Entangled granular media"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1204.6654","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":"sha256:04e2a35151cfbc07f579d9bdec948e451bbe911694f917d4723fd8796a085f61","target":"record","created_at":"2026-05-18T03:56:44Z","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":"c9aebb87eb963c8444fae9e9a1373e63e24ce3b4dda1aa98c87144ace5209b28","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.soft","submitted_at":"2012-04-30T14:50:14Z","title_canon_sha256":"25e2df20ca2d58c77beede9bac7c75c8e2f9c5953b7f3f43e913799ee5387e6d"},"schema_version":"1.0","source":{"id":"1204.6654","kind":"arxiv","version":1}},"canonical_sha256":"9e4df2d0fada066b5fb36107e00d24a8702425364f8cd003a637465d6d5db291","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"9e4df2d0fada066b5fb36107e00d24a8702425364f8cd003a637465d6d5db291","first_computed_at":"2026-05-18T03:56:44.187914Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:56:44.187914Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"1sj+Gh/C+Hjvjam760nc4oAx1jzAnoWq+8zKVFMFoVtNbXtZq4cPdJA9Jw11i12kFar0j0ZdElEoboPxNzTEBQ==","signature_status":"signed_v1","signed_at":"2026-05-18T03:56:44.188462Z","signed_message":"canonical_sha256_bytes"},"source_id":"1204.6654","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:04e2a35151cfbc07f579d9bdec948e451bbe911694f917d4723fd8796a085f61","sha256:dc2291bab20b81b9d288ab99df0f8587b19b26e75d0b388f485db72dc3060e29"],"state_sha256":"0319b669aaf3b1721cb6c81b23b36a3ab222ba0d6a07def5e89fd77f11180c5f"}