{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2008:GLOLO2KSQGQLFMOBCWWPRZ4KYM","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":"7752b4c87f18b97c74387195c2e5dad81c5e8fbd3171b54c9ff8e1d7d57f517e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2008-05-01T14:43:22Z","title_canon_sha256":"c4de73d24e9bd944f5d7ca34b024bb1555d4ba966eac600107766b7321d102d6"},"schema_version":"1.0","source":{"id":"0805.0080","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0805.0080","created_at":"2026-07-04T15:12:49Z"},{"alias_kind":"arxiv_version","alias_value":"0805.0080v1","created_at":"2026-07-04T15:12:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0805.0080","created_at":"2026-07-04T15:12:49Z"},{"alias_kind":"pith_short_12","alias_value":"GLOLO2KSQGQL","created_at":"2026-07-04T15:12:49Z"},{"alias_kind":"pith_short_16","alias_value":"GLOLO2KSQGQLFMOB","created_at":"2026-07-04T15:12:49Z"},{"alias_kind":"pith_short_8","alias_value":"GLOLO2KS","created_at":"2026-07-04T15:12:49Z"}],"graph_snapshots":[{"event_id":"sha256:09b7f004bbac4367492035c0627b3e13036736624bff556296014b8298358c77","target":"graph","created_at":"2026-07-04T15:12:49Z","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/0805.0080/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"An acoustic cloak envelopes an object so that sound incident from all directions passes through and around the cloak as though the object were not present. A theory of acoustic cloaking is developed using the transformation or change-of-variables method for mapping the cloaked region to a point with vanishing scattering strength. We show that the acoustical parameters in the cloak must be anisotropic: either the mass density or the mechanical stiffness or both. If the stiffness is isotropic, corresponding to a fluid with a single bulk modulus, then the inertial density must be infinite at the ","authors_text":"Andrew N. Norris","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2008-05-01T14:43:22Z","title":"Acoustic cloaking theory"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0805.0080","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:e87b2a86285073dca838190437062e3892aa8d048a332b72c9efd9b25a3a193c","target":"record","created_at":"2026-07-04T15:12:49Z","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":"7752b4c87f18b97c74387195c2e5dad81c5e8fbd3171b54c9ff8e1d7d57f517e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2008-05-01T14:43:22Z","title_canon_sha256":"c4de73d24e9bd944f5d7ca34b024bb1555d4ba966eac600107766b7321d102d6"},"schema_version":"1.0","source":{"id":"0805.0080","kind":"arxiv","version":1}},"canonical_sha256":"32dcb7695281a0b2b1c115acf8e78ac314f37cb65bb5c2da227aaa7654c64365","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"32dcb7695281a0b2b1c115acf8e78ac314f37cb65bb5c2da227aaa7654c64365","first_computed_at":"2026-07-04T15:12:49.596150Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T15:12:49.596150Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"UMtdwMk84+XvxCanhkKGQnwy3uNxN8B7H+gEcP++ewE6RsvyiCzNt/QFVJrishne+2mr0qJUsxtmJnEcDeCBAA==","signature_status":"signed_v1","signed_at":"2026-07-04T15:12:49.596620Z","signed_message":"canonical_sha256_bytes"},"source_id":"0805.0080","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e87b2a86285073dca838190437062e3892aa8d048a332b72c9efd9b25a3a193c","sha256:09b7f004bbac4367492035c0627b3e13036736624bff556296014b8298358c77"],"state_sha256":"eb5ddf3b706a9fa3bf356d9e6f958afc3e083812770673c9f896bc550949abd7"}