{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:34K45LED3F5EGNDFSPDGBV7HYS","short_pith_number":"pith:34K45LED","canonical_record":{"source":{"id":"2504.00107","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"gr-qc","submitted_at":"2025-03-31T18:00:29Z","cross_cats_sorted":[],"title_canon_sha256":"b6363a274214916bcd0a30e4ba508b8c199bb17f45d0b0c3b95959a4170ee607","abstract_canon_sha256":"56632d604c5b634993f8c188204109a760ad89c82a3cd6a38faf0190b376246d"},"schema_version":"1.0"},"canonical_sha256":"df15ceac83d97a43346593c660d7e7c487362cd9bad0c166255733c3c0d003ca","source":{"kind":"arxiv","id":"2504.00107","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2504.00107","created_at":"2026-07-05T10:42:20Z"},{"alias_kind":"arxiv_version","alias_value":"2504.00107v1","created_at":"2026-07-05T10:42:20Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2504.00107","created_at":"2026-07-05T10:42:20Z"},{"alias_kind":"pith_short_12","alias_value":"34K45LED3F5E","created_at":"2026-07-05T10:42:20Z"},{"alias_kind":"pith_short_16","alias_value":"34K45LED3F5EGNDF","created_at":"2026-07-05T10:42:20Z"},{"alias_kind":"pith_short_8","alias_value":"34K45LED","created_at":"2026-07-05T10:42:20Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:34K45LED3F5EGNDFSPDGBV7HYS","target":"record","payload":{"canonical_record":{"source":{"id":"2504.00107","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"gr-qc","submitted_at":"2025-03-31T18:00:29Z","cross_cats_sorted":[],"title_canon_sha256":"b6363a274214916bcd0a30e4ba508b8c199bb17f45d0b0c3b95959a4170ee607","abstract_canon_sha256":"56632d604c5b634993f8c188204109a760ad89c82a3cd6a38faf0190b376246d"},"schema_version":"1.0"},"canonical_sha256":"df15ceac83d97a43346593c660d7e7c487362cd9bad0c166255733c3c0d003ca","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T10:42:20.141303Z","signature_b64":"V0ff4ySXyhz/sj2ElLtWkFMSqLD2SB/9zuMSVx56523NoLq9wChBbiDSetnEbvbomt4F3p2UEE8rUaLejsuGBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"df15ceac83d97a43346593c660d7e7c487362cd9bad0c166255733c3c0d003ca","last_reissued_at":"2026-07-05T10:42:20.140795Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T10:42:20.140795Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2504.00107","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T10:42:20Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"pws67hY+kOxa832qnPcKWXVgBwpaIHw99d6uisGW8LgGFO0/gv/HkArcizUmBuxy712MZSx/Up/GIZf/wM4dDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-04T11:34:37.850738Z"},"content_sha256":"417159fa524939b3bf4224b866a5fec375b3a1f1e382921f9f2af4237cdd6dca","schema_version":"1.0","event_id":"sha256:417159fa524939b3bf4224b866a5fec375b3a1f1e382921f9f2af4237cdd6dca"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:34K45LED3F5EGNDFSPDGBV7HYS","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Black hole spectral instabilities in the laboratory: Shallow water analogue","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"gr-qc","authors_text":"Caio F. B. Macedo, Leandro A. Oliveira, Mateus Malato Corr\\^ea, Rodrigo Panosso Macedo","submitted_at":"2025-03-31T18:00:29Z","abstract_excerpt":"Small deviations in the spacetime around black holes can lead to instabilities in the underlying quasinormal mode spectrum, potentially altering the hierarchy of its overtones. A practical way to induce such spectral instability is by introducing small modifications to the effective potential governing the dynamics of fluctuations in the black hole spacetime. While finding a physically meaningful interpretation for such ad hoc modifications in an astrophysical context can be challenging, analogue black hole models provide an alternative framework to explore their effects and study the instabil"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2504.00107","kind":"arxiv","version":1},"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/2504.00107/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":"2026-07-05T10:42:20Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"xgYdQ7D0KkZHonBG3Gj8QrRnHdf3nUKi5BjYRFzgXnXMyHs56nL+YCvQawMb5gpc4vkWW90bS4T4HHlikMTODg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-04T11:34:37.851122Z"},"content_sha256":"2ea284f8abf2ccdfd7632d971e86eff552ce6724efd966a553d3812b337870ef","schema_version":"1.0","event_id":"sha256:2ea284f8abf2ccdfd7632d971e86eff552ce6724efd966a553d3812b337870ef"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/34K45LED3F5EGNDFSPDGBV7HYS/bundle.json","state_url":"https://pith.science/pith/34K45LED3F5EGNDFSPDGBV7HYS/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/34K45LED3F5EGNDFSPDGBV7HYS/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":"2026-08-04T11:34:37Z","links":{"resolver":"https://pith.science/pith/34K45LED3F5EGNDFSPDGBV7HYS","bundle":"https://pith.science/pith/34K45LED3F5EGNDFSPDGBV7HYS/bundle.json","state":"https://pith.science/pith/34K45LED3F5EGNDFSPDGBV7HYS/state.json","well_known_bundle":"https://pith.science/.well-known/pith/34K45LED3F5EGNDFSPDGBV7HYS/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:34K45LED3F5EGNDFSPDGBV7HYS","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":"56632d604c5b634993f8c188204109a760ad89c82a3cd6a38faf0190b376246d","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"gr-qc","submitted_at":"2025-03-31T18:00:29Z","title_canon_sha256":"b6363a274214916bcd0a30e4ba508b8c199bb17f45d0b0c3b95959a4170ee607"},"schema_version":"1.0","source":{"id":"2504.00107","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2504.00107","created_at":"2026-07-05T10:42:20Z"},{"alias_kind":"arxiv_version","alias_value":"2504.00107v1","created_at":"2026-07-05T10:42:20Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2504.00107","created_at":"2026-07-05T10:42:20Z"},{"alias_kind":"pith_short_12","alias_value":"34K45LED3F5E","created_at":"2026-07-05T10:42:20Z"},{"alias_kind":"pith_short_16","alias_value":"34K45LED3F5EGNDF","created_at":"2026-07-05T10:42:20Z"},{"alias_kind":"pith_short_8","alias_value":"34K45LED","created_at":"2026-07-05T10:42:20Z"}],"graph_snapshots":[{"event_id":"sha256:2ea284f8abf2ccdfd7632d971e86eff552ce6724efd966a553d3812b337870ef","target":"graph","created_at":"2026-07-05T10:42:20Z","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/2504.00107/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Small deviations in the spacetime around black holes can lead to instabilities in the underlying quasinormal mode spectrum, potentially altering the hierarchy of its overtones. A practical way to induce such spectral instability is by introducing small modifications to the effective potential governing the dynamics of fluctuations in the black hole spacetime. While finding a physically meaningful interpretation for such ad hoc modifications in an astrophysical context can be challenging, analogue black hole models provide an alternative framework to explore their effects and study the instabil","authors_text":"Caio F. B. Macedo, Leandro A. Oliveira, Mateus Malato Corr\\^ea, Rodrigo Panosso Macedo","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"gr-qc","submitted_at":"2025-03-31T18:00:29Z","title":"Black hole spectral instabilities in the laboratory: Shallow water analogue"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2504.00107","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":"sha256:417159fa524939b3bf4224b866a5fec375b3a1f1e382921f9f2af4237cdd6dca","target":"record","created_at":"2026-07-05T10:42:20Z","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":"56632d604c5b634993f8c188204109a760ad89c82a3cd6a38faf0190b376246d","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"gr-qc","submitted_at":"2025-03-31T18:00:29Z","title_canon_sha256":"b6363a274214916bcd0a30e4ba508b8c199bb17f45d0b0c3b95959a4170ee607"},"schema_version":"1.0","source":{"id":"2504.00107","kind":"arxiv","version":1}},"canonical_sha256":"df15ceac83d97a43346593c660d7e7c487362cd9bad0c166255733c3c0d003ca","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"df15ceac83d97a43346593c660d7e7c487362cd9bad0c166255733c3c0d003ca","first_computed_at":"2026-07-05T10:42:20.140795Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T10:42:20.140795Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"V0ff4ySXyhz/sj2ElLtWkFMSqLD2SB/9zuMSVx56523NoLq9wChBbiDSetnEbvbomt4F3p2UEE8rUaLejsuGBA==","signature_status":"signed_v1","signed_at":"2026-07-05T10:42:20.141303Z","signed_message":"canonical_sha256_bytes"},"source_id":"2504.00107","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:417159fa524939b3bf4224b866a5fec375b3a1f1e382921f9f2af4237cdd6dca","sha256:2ea284f8abf2ccdfd7632d971e86eff552ce6724efd966a553d3812b337870ef"],"state_sha256":"aa56f70327986c123e7b157bb0f5f107e5f2e07b4ddcb9a1ec260f1387d29255"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"gCQtpD1IVXFxQC5/Z9+bUCQ3g20rZILP+k1DFjSldlB4yNhdqFp4Q0esjwgMhBcWcuBi3f4oPVhDhNCZZg5lDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-04T11:34:37.853795Z","bundle_sha256":"2b49961e781458d35ab7979c31cf06f644ee780e90ec4d5cdb02413048c33ed0"}}