{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:SBHWRJ4446CTNCCSUS2QOJZRD3","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":"81faa76cbfdb7888b3b81be4d338e373ef2a7049d3b935ca6f08869ab5b15c8b","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2014-05-02T20:23:47Z","title_canon_sha256":"42692d9bf8321b8eef06d7b5d991d019165e9956d2aa3c9cd41f52a4f47f1eaa"},"schema_version":"1.0","source":{"id":"1405.0504","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1405.0504","created_at":"2026-05-18T02:52:41Z"},{"alias_kind":"arxiv_version","alias_value":"1405.0504v1","created_at":"2026-05-18T02:52:41Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1405.0504","created_at":"2026-05-18T02:52:41Z"},{"alias_kind":"pith_short_12","alias_value":"SBHWRJ4446CT","created_at":"2026-05-18T12:28:49Z"},{"alias_kind":"pith_short_16","alias_value":"SBHWRJ4446CTNCCS","created_at":"2026-05-18T12:28:49Z"},{"alias_kind":"pith_short_8","alias_value":"SBHWRJ44","created_at":"2026-05-18T12:28:49Z"}],"graph_snapshots":[{"event_id":"sha256:7c0c3a59b794a2773a631edc8d6422e4ce83d93c8a8b100380af9da4f834842b","target":"graph","created_at":"2026-05-18T02:52:41Z","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"},"paper":{"abstract_excerpt":"The first direct observation of gravitational waves' action upon matter has recently been reported by the BICEP2 experiment. Advanced ground-based gravitational-wave detectors are being installed. They will soon be commissioned, and then begin searches for high-frequency gravitational waves at a sensitivity level that is widely expected to reach events involving compact objects like stellar mass black holes and neutron stars. Pulsar timing arrays continue to improve the bounds on gravitational waves at nanohertz frequencies, and may detect a signal on roughly the same timescale as ground-based","authors_text":"Scott A. Hughes","cross_cats":["astro-ph.CO"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2014-05-02T20:23:47Z","title":"Gravitational wave astronomy and cosmology"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1405.0504","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":"sha256:43d23f941945f064278223de73eb67783b7a22f9f88ed464f3daadd6e7508c9b","target":"record","created_at":"2026-05-18T02:52:41Z","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":"81faa76cbfdb7888b3b81be4d338e373ef2a7049d3b935ca6f08869ab5b15c8b","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2014-05-02T20:23:47Z","title_canon_sha256":"42692d9bf8321b8eef06d7b5d991d019165e9956d2aa3c9cd41f52a4f47f1eaa"},"schema_version":"1.0","source":{"id":"1405.0504","kind":"arxiv","version":1}},"canonical_sha256":"904f68a79ce785368852a4b50727311ef2a13edb671fad06ff6ee6cf58ab8fb9","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"904f68a79ce785368852a4b50727311ef2a13edb671fad06ff6ee6cf58ab8fb9","first_computed_at":"2026-05-18T02:52:41.305195Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:52:41.305195Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"4BJpw6zmGqq4njzx0QLCWheQRLMcMKEMhhYnJO2tgyqwTnC3dD2WvOjrF7qms8aPHdaRD4vwYAiJkgIdFJEqDw==","signature_status":"signed_v1","signed_at":"2026-05-18T02:52:41.305815Z","signed_message":"canonical_sha256_bytes"},"source_id":"1405.0504","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:43d23f941945f064278223de73eb67783b7a22f9f88ed464f3daadd6e7508c9b","sha256:7c0c3a59b794a2773a631edc8d6422e4ce83d93c8a8b100380af9da4f834842b"],"state_sha256":"8d7d2f5accb285467c40a4e6e1f1946fabcaf51dd66703c686a4256a27a31618"}