{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2002:FEC3N3XVGUQQYLIIGUJBCRIWBF","short_pith_number":"pith:FEC3N3XV","canonical_record":{"source":{"id":"gr-qc/0205099","kind":"arxiv","version":2},"metadata":{"license":"","primary_cat":"gr-qc","submitted_at":"2002-05-23T00:00:05Z","cross_cats_sorted":[],"title_canon_sha256":"02de2e1d9fd54f6fd25a8ad14d6a6fc234dd526df72eb34264f3aaa368287120","abstract_canon_sha256":"e045655b62d8728a515b7ff0454aeaf84dfd4b6c8bc29c89f6ed8503133b4158"},"schema_version":"1.0"},"canonical_sha256":"2905b6eef535210c2d08351211451609572e35b0f1faf24062d234460fbf06b9","source":{"kind":"arxiv","id":"gr-qc/0205099","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"gr-qc/0205099","created_at":"2026-07-04T16:33:44Z"},{"alias_kind":"arxiv_version","alias_value":"gr-qc/0205099v2","created_at":"2026-07-04T16:33:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.gr-qc/0205099","created_at":"2026-07-04T16:33:44Z"},{"alias_kind":"pith_short_12","alias_value":"FEC3N3XVGUQQ","created_at":"2026-07-04T16:33:44Z"},{"alias_kind":"pith_short_16","alias_value":"FEC3N3XVGUQQYLII","created_at":"2026-07-04T16:33:44Z"},{"alias_kind":"pith_short_8","alias_value":"FEC3N3XV","created_at":"2026-07-04T16:33:44Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2002:FEC3N3XVGUQQYLIIGUJBCRIWBF","target":"record","payload":{"canonical_record":{"source":{"id":"gr-qc/0205099","kind":"arxiv","version":2},"metadata":{"license":"","primary_cat":"gr-qc","submitted_at":"2002-05-23T00:00:05Z","cross_cats_sorted":[],"title_canon_sha256":"02de2e1d9fd54f6fd25a8ad14d6a6fc234dd526df72eb34264f3aaa368287120","abstract_canon_sha256":"e045655b62d8728a515b7ff0454aeaf84dfd4b6c8bc29c89f6ed8503133b4158"},"schema_version":"1.0"},"canonical_sha256":"2905b6eef535210c2d08351211451609572e35b0f1faf24062d234460fbf06b9","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T16:33:44.448142Z","signature_b64":"Krv1SB7EmYyLgm0eW1upc9Lyn4ctFgbAII8D0FuZyE1kSsJeaIjtAe+DCbtFiAYrZwBwz56xzIIwOnVmh1UjAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"2905b6eef535210c2d08351211451609572e35b0f1faf24062d234460fbf06b9","last_reissued_at":"2026-07-04T16:33:44.447750Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T16:33:44.447750Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"gr-qc/0205099","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-04T16:33:44Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"qujXqSziWE2+wEw7DJzg4NM9Qt5NU+Pt0x7kuOhvz1sE+jVLjbT50SMbB2LTb2cmty93E2DVMMbxeJSNGXGjBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-07T13:03:51.073173Z"},"content_sha256":"4e3c71681b6a2dc994e671d0c0f8eb2a83ba48f36dc92dc96d9aa63199f4ccf8","schema_version":"1.0","event_id":"sha256:4e3c71681b6a2dc994e671d0c0f8eb2a83ba48f36dc92dc96d9aa63199f4ccf8"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2002:FEC3N3XVGUQQYLIIGUJBCRIWBF","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Gravity wave analogs of black holes","license":"","headline":"","cross_cats":[],"primary_cat":"gr-qc","authors_text":"Ralf Sch\\\"utzhold, William G. Unruh","submitted_at":"2002-05-23T00:00:05Z","abstract_excerpt":"It is demonstrated that gravity waves of a flowing fluid in a shallow basin can be used to simulate phenomena around black holes in the laboratory. Since the speed of the gravity waves as well as their high-wavenumber dispersion (subluminal vs. superluminal) can be adjusted easily by varying the height of the fluid (and its surface tension) this scenario has certain advantages over the sonic and dielectric black hole analogs, for example, although its use in testing quantum effects is dubious. It can be used to investigate the various classical instabilities associated with black (and white) h"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"gr-qc/0205099","kind":"arxiv","version":2},"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/gr-qc/0205099/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":"2026-07-04T16:33:44Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"bCVj3NMj0RemcRq+BEun1aRV3sG2Fl7NWjP8yqooxoZx+rAOPGNzqh8+9BbhYvVtaVuASLTLaRkq6IvUPAP+Aw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-07T13:03:51.073976Z"},"content_sha256":"7d127b847b8762e3c06f36527d7a7282c0ea307ff9145b46f0830c9c3717ab68","schema_version":"1.0","event_id":"sha256:7d127b847b8762e3c06f36527d7a7282c0ea307ff9145b46f0830c9c3717ab68"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/FEC3N3XVGUQQYLIIGUJBCRIWBF/bundle.json","state_url":"https://pith.science/pith/FEC3N3XVGUQQYLIIGUJBCRIWBF/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/FEC3N3XVGUQQYLIIGUJBCRIWBF/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":"2026-07-07T13:03:51Z","links":{"resolver":"https://pith.science/pith/FEC3N3XVGUQQYLIIGUJBCRIWBF","bundle":"https://pith.science/pith/FEC3N3XVGUQQYLIIGUJBCRIWBF/bundle.json","state":"https://pith.science/pith/FEC3N3XVGUQQYLIIGUJBCRIWBF/state.json","well_known_bundle":"https://pith.science/.well-known/pith/FEC3N3XVGUQQYLIIGUJBCRIWBF/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2002:FEC3N3XVGUQQYLIIGUJBCRIWBF","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":"e045655b62d8728a515b7ff0454aeaf84dfd4b6c8bc29c89f6ed8503133b4158","cross_cats_sorted":[],"license":"","primary_cat":"gr-qc","submitted_at":"2002-05-23T00:00:05Z","title_canon_sha256":"02de2e1d9fd54f6fd25a8ad14d6a6fc234dd526df72eb34264f3aaa368287120"},"schema_version":"1.0","source":{"id":"gr-qc/0205099","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"gr-qc/0205099","created_at":"2026-07-04T16:33:44Z"},{"alias_kind":"arxiv_version","alias_value":"gr-qc/0205099v2","created_at":"2026-07-04T16:33:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.gr-qc/0205099","created_at":"2026-07-04T16:33:44Z"},{"alias_kind":"pith_short_12","alias_value":"FEC3N3XVGUQQ","created_at":"2026-07-04T16:33:44Z"},{"alias_kind":"pith_short_16","alias_value":"FEC3N3XVGUQQYLII","created_at":"2026-07-04T16:33:44Z"},{"alias_kind":"pith_short_8","alias_value":"FEC3N3XV","created_at":"2026-07-04T16:33:44Z"}],"graph_snapshots":[{"event_id":"sha256:7d127b847b8762e3c06f36527d7a7282c0ea307ff9145b46f0830c9c3717ab68","target":"graph","created_at":"2026-07-04T16:33:44Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/gr-qc/0205099/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"It is demonstrated that gravity waves of a flowing fluid in a shallow basin can be used to simulate phenomena around black holes in the laboratory. Since the speed of the gravity waves as well as their high-wavenumber dispersion (subluminal vs. superluminal) can be adjusted easily by varying the height of the fluid (and its surface tension) this scenario has certain advantages over the sonic and dielectric black hole analogs, for example, although its use in testing quantum effects is dubious. It can be used to investigate the various classical instabilities associated with black (and white) h","authors_text":"Ralf Sch\\\"utzhold, William G. Unruh","cross_cats":[],"headline":"","license":"","primary_cat":"gr-qc","submitted_at":"2002-05-23T00:00:05Z","title":"Gravity wave analogs of black holes"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"gr-qc/0205099","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":"sha256:4e3c71681b6a2dc994e671d0c0f8eb2a83ba48f36dc92dc96d9aa63199f4ccf8","target":"record","created_at":"2026-07-04T16:33:44Z","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":"e045655b62d8728a515b7ff0454aeaf84dfd4b6c8bc29c89f6ed8503133b4158","cross_cats_sorted":[],"license":"","primary_cat":"gr-qc","submitted_at":"2002-05-23T00:00:05Z","title_canon_sha256":"02de2e1d9fd54f6fd25a8ad14d6a6fc234dd526df72eb34264f3aaa368287120"},"schema_version":"1.0","source":{"id":"gr-qc/0205099","kind":"arxiv","version":2}},"canonical_sha256":"2905b6eef535210c2d08351211451609572e35b0f1faf24062d234460fbf06b9","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"2905b6eef535210c2d08351211451609572e35b0f1faf24062d234460fbf06b9","first_computed_at":"2026-07-04T16:33:44.447750Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T16:33:44.447750Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Krv1SB7EmYyLgm0eW1upc9Lyn4ctFgbAII8D0FuZyE1kSsJeaIjtAe+DCbtFiAYrZwBwz56xzIIwOnVmh1UjAQ==","signature_status":"signed_v1","signed_at":"2026-07-04T16:33:44.448142Z","signed_message":"canonical_sha256_bytes"},"source_id":"gr-qc/0205099","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:4e3c71681b6a2dc994e671d0c0f8eb2a83ba48f36dc92dc96d9aa63199f4ccf8","sha256:7d127b847b8762e3c06f36527d7a7282c0ea307ff9145b46f0830c9c3717ab68"],"state_sha256":"f664d61317bb480658345a825314ca19deb08ff8d88276ce281b3474c4600475"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"CAiLbVdQfmKXTm0UIgD8xGBj8sL0ECmzp5xawHnI0cQeHTL4B0POuT4WHy79cGzaiXlPqBeiX79+srWL9LU8AA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-07T13:03:51.078299Z","bundle_sha256":"acf319cc5a12cca206390bf5134fa354e706875a991edf31a69290b31d96fc9a"}}