{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2018:2L7THPCGDZUE25D62JSQHTOJ6B","short_pith_number":"pith:2L7THPCG","schema_version":"1.0","canonical_sha256":"d2ff33bc461e684d747ed26503cdc9f0742315799895c2c3c0a992b9b05b9933","source":{"kind":"arxiv","id":"1808.06939","version":4},"attestation_state":"computed","paper":{"title":"On a WKB formula for echoes","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"gr-qc","authors_text":"L. Sebastiani, L. Vanzo, S. Zerbini","submitted_at":"2018-08-20T08:41:23Z","abstract_excerpt":"We present an unified approach for the study of idealized gravitational compact objects like wormholes and horizonless stars, here simulated by the presence of boundary conditions at a deeply inner wall. At classical level, namely neglecting quantum effects, the presence of the wall leads to characteristic echoes following the usual ringdown phase, such that it can discriminate black holes from other horizonless, and probably exotic, compact objects. With regard to this issue, an analytical though approximated expression for the complex frequencies of the quasinormal echoes is found and discus"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1808.06939","kind":"arxiv","version":4},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2018-08-20T08:41:23Z","cross_cats_sorted":[],"title_canon_sha256":"72a002b9d1d18e7facc353f07fea0aa13d9ad50b28f6ad0f641386c98af61682","abstract_canon_sha256":"91f675834fdfcee9dadbf0e3041887610711889f7a5d5e2a3025f00dcd34fc11"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T00:17:24.784215Z","signature_b64":"W6Sr2ScPQHytuN6He4rK7lnSsBbnJdJDLEREPbUQgwxYjhx86Z6+uPWDdXngDKrGw8gBamT1CDBKZd19WC3BBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d2ff33bc461e684d747ed26503cdc9f0742315799895c2c3c0a992b9b05b9933","last_reissued_at":"2026-07-05T00:17:24.783805Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T00:17:24.783805Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"On a WKB formula for echoes","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"gr-qc","authors_text":"L. Sebastiani, L. Vanzo, S. Zerbini","submitted_at":"2018-08-20T08:41:23Z","abstract_excerpt":"We present an unified approach for the study of idealized gravitational compact objects like wormholes and horizonless stars, here simulated by the presence of boundary conditions at a deeply inner wall. At classical level, namely neglecting quantum effects, the presence of the wall leads to characteristic echoes following the usual ringdown phase, such that it can discriminate black holes from other horizonless, and probably exotic, compact objects. With regard to this issue, an analytical though approximated expression for the complex frequencies of the quasinormal echoes is found and discus"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1808.06939","kind":"arxiv","version":4},"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/1808.06939/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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1808.06939","created_at":"2026-07-05T00:17:24.783860+00:00"},{"alias_kind":"arxiv_version","alias_value":"1808.06939v4","created_at":"2026-07-05T00:17:24.783860+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1808.06939","created_at":"2026-07-05T00:17:24.783860+00:00"},{"alias_kind":"pith_short_12","alias_value":"2L7THPCGDZUE","created_at":"2026-07-05T00:17:24.783860+00:00"},{"alias_kind":"pith_short_16","alias_value":"2L7THPCGDZUE25D6","created_at":"2026-07-05T00:17:24.783860+00:00"},{"alias_kind":"pith_short_8","alias_value":"2L7THPCG","created_at":"2026-07-05T00:17:24.783860+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":1,"internal_anchor_count":0,"sample":[{"citing_arxiv_id":"1904.05363","citing_title":"Testing the nature of dark compact objects: a status report","ref_index":283,"is_internal_anchor":false}]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/2L7THPCGDZUE25D62JSQHTOJ6B","json":"https://pith.science/pith/2L7THPCGDZUE25D62JSQHTOJ6B.json","graph_json":"https://pith.science/api/pith-number/2L7THPCGDZUE25D62JSQHTOJ6B/graph.json","events_json":"https://pith.science/api/pith-number/2L7THPCGDZUE25D62JSQHTOJ6B/events.json","paper":"https://pith.science/paper/2L7THPCG"},"agent_actions":{"view_html":"https://pith.science/pith/2L7THPCGDZUE25D62JSQHTOJ6B","download_json":"https://pith.science/pith/2L7THPCGDZUE25D62JSQHTOJ6B.json","view_paper":"https://pith.science/paper/2L7THPCG","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1808.06939&json=true","fetch_graph":"https://pith.science/api/pith-number/2L7THPCGDZUE25D62JSQHTOJ6B/graph.json","fetch_events":"https://pith.science/api/pith-number/2L7THPCGDZUE25D62JSQHTOJ6B/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/2L7THPCGDZUE25D62JSQHTOJ6B/action/timestamp_anchor","attest_storage":"https://pith.science/pith/2L7THPCGDZUE25D62JSQHTOJ6B/action/storage_attestation","attest_author":"https://pith.science/pith/2L7THPCGDZUE25D62JSQHTOJ6B/action/author_attestation","sign_citation":"https://pith.science/pith/2L7THPCGDZUE25D62JSQHTOJ6B/action/citation_signature","submit_replication":"https://pith.science/pith/2L7THPCGDZUE25D62JSQHTOJ6B/action/replication_record"}},"created_at":"2026-07-05T00:17:24.783860+00:00","updated_at":"2026-07-05T00:17:24.783860+00:00"}