{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2019:LTCBRBXQFRN75RUUBDT3B5FBNP","short_pith_number":"pith:LTCBRBXQ","schema_version":"1.0","canonical_sha256":"5cc41886f02c5bfec69408e7b0f4a16bfac12aa03210084d7e194cfe255a8fe1","source":{"kind":"arxiv","id":"1910.00561","version":3},"attestation_state":"computed","paper":{"title":"Vacuum gravitational fields with a null Killing vector","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"gr-qc","authors_text":"G. Dautcourt","submitted_at":"2019-10-01T17:35:48Z","abstract_excerpt":"Vacuum gravitational fields admitting a light-like Killing field were systematically studied starting around 1960. Besides the already known plane waves, a second class of gravitational wave fields was found. In contrast to plane waves, their wave surfaces were not flat, but had a negative Gaussian curvature. Recently, such solutions found attention again as \"twisted gravitational waves\". In the paper we review and extend the earlier results. In suitable coordinates, the metric assumes a simple shape. The waves are then determined by a single function that satisfies a Laplace equation in cylin"},"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":"1910.00561","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2019-10-01T17:35:48Z","cross_cats_sorted":[],"title_canon_sha256":"1d3772704cf92dedadf5c052cf3edcff0d276abb06f7da067a7bf4863afd5232","abstract_canon_sha256":"bd19e14460cf1ae23e4023017d353016f34b6ec8b629ed972b5d78f462618b7f"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T00:38:33.818680Z","signature_b64":"xAvOKwaRnFBb+fstNUjbARJW0zMZPFSNmzhJSPISHSl75hkVJ8eADDsy/7WkVpaGLKpdG3UBAtpSSIqK+TrTDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"5cc41886f02c5bfec69408e7b0f4a16bfac12aa03210084d7e194cfe255a8fe1","last_reissued_at":"2026-07-05T00:38:33.818269Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T00:38:33.818269Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Vacuum gravitational fields with a null Killing vector","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"gr-qc","authors_text":"G. Dautcourt","submitted_at":"2019-10-01T17:35:48Z","abstract_excerpt":"Vacuum gravitational fields admitting a light-like Killing field were systematically studied starting around 1960. Besides the already known plane waves, a second class of gravitational wave fields was found. In contrast to plane waves, their wave surfaces were not flat, but had a negative Gaussian curvature. Recently, such solutions found attention again as \"twisted gravitational waves\". In the paper we review and extend the earlier results. In suitable coordinates, the metric assumes a simple shape. The waves are then determined by a single function that satisfies a Laplace equation in cylin"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1910.00561","kind":"arxiv","version":3},"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/1910.00561/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":"1910.00561","created_at":"2026-07-05T00:38:33.818335+00:00"},{"alias_kind":"arxiv_version","alias_value":"1910.00561v3","created_at":"2026-07-05T00:38:33.818335+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1910.00561","created_at":"2026-07-05T00:38:33.818335+00:00"},{"alias_kind":"pith_short_12","alias_value":"LTCBRBXQFRN7","created_at":"2026-07-05T00:38:33.818335+00:00"},{"alias_kind":"pith_short_16","alias_value":"LTCBRBXQFRN75RUU","created_at":"2026-07-05T00:38:33.818335+00:00"},{"alias_kind":"pith_short_8","alias_value":"LTCBRBXQ","created_at":"2026-07-05T00:38:33.818335+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":1,"internal_anchor_count":1,"sample":[{"citing_arxiv_id":"2501.11503","citing_title":"Elliptically Polarized Plane Gravitational Waves","ref_index":34,"is_internal_anchor":true}]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/LTCBRBXQFRN75RUUBDT3B5FBNP","json":"https://pith.science/pith/LTCBRBXQFRN75RUUBDT3B5FBNP.json","graph_json":"https://pith.science/api/pith-number/LTCBRBXQFRN75RUUBDT3B5FBNP/graph.json","events_json":"https://pith.science/api/pith-number/LTCBRBXQFRN75RUUBDT3B5FBNP/events.json","paper":"https://pith.science/paper/LTCBRBXQ"},"agent_actions":{"view_html":"https://pith.science/pith/LTCBRBXQFRN75RUUBDT3B5FBNP","download_json":"https://pith.science/pith/LTCBRBXQFRN75RUUBDT3B5FBNP.json","view_paper":"https://pith.science/paper/LTCBRBXQ","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1910.00561&json=true","fetch_graph":"https://pith.science/api/pith-number/LTCBRBXQFRN75RUUBDT3B5FBNP/graph.json","fetch_events":"https://pith.science/api/pith-number/LTCBRBXQFRN75RUUBDT3B5FBNP/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/LTCBRBXQFRN75RUUBDT3B5FBNP/action/timestamp_anchor","attest_storage":"https://pith.science/pith/LTCBRBXQFRN75RUUBDT3B5FBNP/action/storage_attestation","attest_author":"https://pith.science/pith/LTCBRBXQFRN75RUUBDT3B5FBNP/action/author_attestation","sign_citation":"https://pith.science/pith/LTCBRBXQFRN75RUUBDT3B5FBNP/action/citation_signature","submit_replication":"https://pith.science/pith/LTCBRBXQFRN75RUUBDT3B5FBNP/action/replication_record"}},"created_at":"2026-07-05T00:38:33.818335+00:00","updated_at":"2026-07-05T00:38:33.818335+00:00"}