{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2023:74LO25YJNGPLT2AEEMYMMEYZLO","short_pith_number":"pith:74LO25YJ","schema_version":"1.0","canonical_sha256":"ff16ed7709699eb9e8042330c613195ba21196004cffeed767e41284304c1190","source":{"kind":"arxiv","id":"2303.15512","version":2},"attestation_state":"computed","paper":{"title":"Creases, corners and caustics: properties of non-smooth structures on black hole horizons","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-th"],"primary_cat":"gr-qc","authors_text":"Harvey S. Reall, Maxime Gadioux","submitted_at":"2023-03-27T18:00:05Z","abstract_excerpt":"The event horizon of a dynamical black hole is generically a non-smooth hypersurface. We classify the types of non-smooth structure that can arise on a horizon that is smooth at late time. The classification includes creases, corners and caustic points. We prove that creases and corners form spacelike submanifolds of dimension $2,1$ and that caustic points form a set of dimension at most $1$. We classify \"perestroikas\" of these structures, in which they undergo a qualitative change at an instant of time. A crease perestroika gives an exact local description of the event horizon near the \"insta"},"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":"2303.15512","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2023-03-27T18:00:05Z","cross_cats_sorted":["hep-th"],"title_canon_sha256":"d847f9ff6f542f382ca947c18ccd11365dc86fa1bc6ddb0872fc8e8e2e185cc8","abstract_canon_sha256":"aede72a742b1ac22765da3a845d9df0a120cb8b111a5f3bae5602bcf4c728115"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T06:49:59.813483Z","signature_b64":"IALFj8MykBOnG6GdTDE8svFaMn1JGntMOb8XP9Dbfk0j+yGLDdbuU9RsOtna6YfoKfvTgn/CPaXmUi/TkXF1BQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ff16ed7709699eb9e8042330c613195ba21196004cffeed767e41284304c1190","last_reissued_at":"2026-07-05T06:49:59.812969Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T06:49:59.812969Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Creases, corners and caustics: properties of non-smooth structures on black hole horizons","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-th"],"primary_cat":"gr-qc","authors_text":"Harvey S. Reall, Maxime Gadioux","submitted_at":"2023-03-27T18:00:05Z","abstract_excerpt":"The event horizon of a dynamical black hole is generically a non-smooth hypersurface. We classify the types of non-smooth structure that can arise on a horizon that is smooth at late time. The classification includes creases, corners and caustic points. We prove that creases and corners form spacelike submanifolds of dimension $2,1$ and that caustic points form a set of dimension at most $1$. We classify \"perestroikas\" of these structures, in which they undergo a qualitative change at an instant of time. A crease perestroika gives an exact local description of the event horizon near the \"insta"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2303.15512","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/2303.15512/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":"2303.15512","created_at":"2026-07-05T06:49:59.813038+00:00"},{"alias_kind":"arxiv_version","alias_value":"2303.15512v2","created_at":"2026-07-05T06:49:59.813038+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2303.15512","created_at":"2026-07-05T06:49:59.813038+00:00"},{"alias_kind":"pith_short_12","alias_value":"74LO25YJNGPL","created_at":"2026-07-05T06:49:59.813038+00:00"},{"alias_kind":"pith_short_16","alias_value":"74LO25YJNGPLT2AE","created_at":"2026-07-05T06:49:59.813038+00:00"},{"alias_kind":"pith_short_8","alias_value":"74LO25YJ","created_at":"2026-07-05T06:49:59.813038+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":3,"internal_anchor_count":1,"sample":[{"citing_arxiv_id":"2607.07785","citing_title":"Quantization of Gravity on Null Hypersurfaces","ref_index":90,"is_internal_anchor":true},{"citing_arxiv_id":"2509.05052","citing_title":"Semi-classical spacetime thermodynamics","ref_index":71,"is_internal_anchor":false},{"citing_arxiv_id":"2604.00170","citing_title":"Thermodynamics of dynamical black holes beyond perturbation theory","ref_index":91,"is_internal_anchor":false}]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/74LO25YJNGPLT2AEEMYMMEYZLO","json":"https://pith.science/pith/74LO25YJNGPLT2AEEMYMMEYZLO.json","graph_json":"https://pith.science/api/pith-number/74LO25YJNGPLT2AEEMYMMEYZLO/graph.json","events_json":"https://pith.science/api/pith-number/74LO25YJNGPLT2AEEMYMMEYZLO/events.json","paper":"https://pith.science/paper/74LO25YJ"},"agent_actions":{"view_html":"https://pith.science/pith/74LO25YJNGPLT2AEEMYMMEYZLO","download_json":"https://pith.science/pith/74LO25YJNGPLT2AEEMYMMEYZLO.json","view_paper":"https://pith.science/paper/74LO25YJ","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2303.15512&json=true","fetch_graph":"https://pith.science/api/pith-number/74LO25YJNGPLT2AEEMYMMEYZLO/graph.json","fetch_events":"https://pith.science/api/pith-number/74LO25YJNGPLT2AEEMYMMEYZLO/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/74LO25YJNGPLT2AEEMYMMEYZLO/action/timestamp_anchor","attest_storage":"https://pith.science/pith/74LO25YJNGPLT2AEEMYMMEYZLO/action/storage_attestation","attest_author":"https://pith.science/pith/74LO25YJNGPLT2AEEMYMMEYZLO/action/author_attestation","sign_citation":"https://pith.science/pith/74LO25YJNGPLT2AEEMYMMEYZLO/action/citation_signature","submit_replication":"https://pith.science/pith/74LO25YJNGPLT2AEEMYMMEYZLO/action/replication_record"}},"created_at":"2026-07-05T06:49:59.813038+00:00","updated_at":"2026-07-05T06:49:59.813038+00:00"}