{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:GZV5756GIC2TZKEJNDKBG5RG42","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":"29adad273abe6cdd91beff13822d4bc08c2a64ae423fafd2ca19315635889ab3","cross_cats_sorted":["math.NA","physics.comp-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.class-ph","submitted_at":"2011-09-15T07:56:12Z","title_canon_sha256":"a4c1575aa14902c9fd2db0ecdbcc2bdece8945bb3370c99af1687cff14ada7f0"},"schema_version":"1.0","source":{"id":"1109.3281","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1109.3281","created_at":"2026-05-18T03:45:00Z"},{"alias_kind":"arxiv_version","alias_value":"1109.3281v2","created_at":"2026-05-18T03:45:00Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1109.3281","created_at":"2026-05-18T03:45:00Z"},{"alias_kind":"pith_short_12","alias_value":"GZV5756GIC2T","created_at":"2026-05-18T12:26:30Z"},{"alias_kind":"pith_short_16","alias_value":"GZV5756GIC2TZKEJ","created_at":"2026-05-18T12:26:30Z"},{"alias_kind":"pith_short_8","alias_value":"GZV5756G","created_at":"2026-05-18T12:26:30Z"}],"graph_snapshots":[{"event_id":"sha256:bcc59e627823b1e4a053eaeddcc54081c8fbcb54d47c91941e90390b46aec1c8","target":"graph","created_at":"2026-05-18T03:45:00Z","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":"Numerical methods are developed to simulate the wave propagation in heterogeneous 2D fluid / poroelastic media. Wave propagation is described by the usual acoustics equations (in the fluid medium) and by the low-frequency Biot's equations (in the porous medium). Interface conditions are introduced to model various hydraulic contacts between the two media: open pores, sealed pores, and imperfect pores. Well-possedness of the initial-boundary value problem is proven. Cartesian grid numerical methods previously developed in porous heterogeneous media are adapted to the present context: a fourth-o","authors_text":"Bruno Lombard (LMA), Guillaume Chiavassa (ECM)","cross_cats":["math.NA","physics.comp-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.class-ph","submitted_at":"2011-09-15T07:56:12Z","title":"Wave propagation across acoustic / Biot's media: a finite-difference method"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1109.3281","kind":"arxiv","version":2},"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":"sha256:78e4fea6523494ab8b0d48188878c5d2bcbd1dc555e8df7d0da65bcd73628012","target":"record","created_at":"2026-05-18T03:45:00Z","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":"29adad273abe6cdd91beff13822d4bc08c2a64ae423fafd2ca19315635889ab3","cross_cats_sorted":["math.NA","physics.comp-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.class-ph","submitted_at":"2011-09-15T07:56:12Z","title_canon_sha256":"a4c1575aa14902c9fd2db0ecdbcc2bdece8945bb3370c99af1687cff14ada7f0"},"schema_version":"1.0","source":{"id":"1109.3281","kind":"arxiv","version":2}},"canonical_sha256":"366bdff7c640b53ca88968d4137626e68e9a1b1fa717e99363a95151c850618c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"366bdff7c640b53ca88968d4137626e68e9a1b1fa717e99363a95151c850618c","first_computed_at":"2026-05-18T03:45:00.963173Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:45:00.963173Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"bSWhpUZTu1WHdT5tgFSzWG8+Yi02nYGFzzhABQAJGfyQzyipgcwdQpsQJczjItu/q0yjFKxdCEphfjH7ISOqDw==","signature_status":"signed_v1","signed_at":"2026-05-18T03:45:00.963875Z","signed_message":"canonical_sha256_bytes"},"source_id":"1109.3281","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:78e4fea6523494ab8b0d48188878c5d2bcbd1dc555e8df7d0da65bcd73628012","sha256:bcc59e627823b1e4a053eaeddcc54081c8fbcb54d47c91941e90390b46aec1c8"],"state_sha256":"40aa74cf3b21e65f8276b34036d34741547f8585091c2e511127ee88d76dd00c"}