{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2024:P6QL2CBU5TY2UQK56IVXAWER4A","short_pith_number":"pith:P6QL2CBU","canonical_record":{"source":{"id":"2404.02864","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2024-04-03T16:57:19Z","cross_cats_sorted":["astro-ph.HE","gr-qc","hep-ph"],"title_canon_sha256":"0047dd6fd3b5af94faa782d97907d949a98a424d46e6297f3b5ccae49f212404","abstract_canon_sha256":"a3e383a5bf65c0decdbbbce3b07d0b36c2c126bf8c9f39bc98c2e1a4c9ef545a"},"schema_version":"1.0"},"canonical_sha256":"7fa0bd0834ecf1aa415df22b705891e00fa727e50f209c4f7ddeae7c10f772e4","source":{"kind":"arxiv","id":"2404.02864","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2404.02864","created_at":"2026-07-05T08:04:02Z"},{"alias_kind":"arxiv_version","alias_value":"2404.02864v1","created_at":"2026-07-05T08:04:02Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2404.02864","created_at":"2026-07-05T08:04:02Z"},{"alias_kind":"pith_short_12","alias_value":"P6QL2CBU5TY2","created_at":"2026-07-05T08:04:02Z"},{"alias_kind":"pith_short_16","alias_value":"P6QL2CBU5TY2UQK5","created_at":"2026-07-05T08:04:02Z"},{"alias_kind":"pith_short_8","alias_value":"P6QL2CBU","created_at":"2026-07-05T08:04:02Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2024:P6QL2CBU5TY2UQK56IVXAWER4A","target":"record","payload":{"canonical_record":{"source":{"id":"2404.02864","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2024-04-03T16:57:19Z","cross_cats_sorted":["astro-ph.HE","gr-qc","hep-ph"],"title_canon_sha256":"0047dd6fd3b5af94faa782d97907d949a98a424d46e6297f3b5ccae49f212404","abstract_canon_sha256":"a3e383a5bf65c0decdbbbce3b07d0b36c2c126bf8c9f39bc98c2e1a4c9ef545a"},"schema_version":"1.0"},"canonical_sha256":"7fa0bd0834ecf1aa415df22b705891e00fa727e50f209c4f7ddeae7c10f772e4","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T08:04:02.121297Z","signature_b64":"KK6LbIDax9TRop3Ezl2m7h/WrXcGygxGJvP0uhu6gVGf6djtZbXIloN41AZc2QloJ2VbEvml64FzppXZwBavDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"7fa0bd0834ecf1aa415df22b705891e00fa727e50f209c4f7ddeae7c10f772e4","last_reissued_at":"2026-07-05T08:04:02.120881Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T08:04:02.120881Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2404.02864","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":"2026-07-05T08:04:02Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"AeyQMNvzb/ARmS6Z3exq0Hp6XEfDpvN4L/pUpzYs+RTZ23ssfmmPDPnR56HegJrttMnl4/i1VZv47qq70yBEAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-04T15:35:23.439766Z"},"content_sha256":"d9325ee24da4082e143ed3a83d86596607e3e9ad7c3c86deb860d19820cb2052","schema_version":"1.0","event_id":"sha256:d9325ee24da4082e143ed3a83d86596607e3e9ad7c3c86deb860d19820cb2052"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2024:P6QL2CBU5TY2UQK56IVXAWER4A","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Forecasting the sensitivity of Pulsar Timing Arrays to gravitational wave backgrounds","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.HE","gr-qc","hep-ph"],"primary_cat":"astro-ph.CO","authors_text":"Gabriele Franciolini, Mauro Pieroni, Mikel Falxa, Stanislav Babak","submitted_at":"2024-04-03T16:57:19Z","abstract_excerpt":"Pulsar Timing Array (PTA) observations hinted towards the existence of a stochastic gravitational wave background (SGWB) in the nHz frequency band. Still, the nature of the SGWB signal cannot be confidently inferred from current data, and the leading explanation invokes mergers of supermassive black holes. If confirmed, such discovery would not only represent a turning point in our understanding of astrophysics, but it may severely limit the capability of searching for additional cosmological sources in the nHz frequency range. In this work, we build a simple framework to forecast the sensitiv"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2404.02864","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/2404.02864/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":"2026-07-05T08:04:02Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"b2hoDHKgGgpWtBJbqf7L7bzHZZzP63+fdqI1xwilu2JqXbd7km2yCa3yTFlAbvlnqEstGFuaHx19BAnP1veQCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-04T15:35:23.441606Z"},"content_sha256":"65a533394448ddb2b324158bfcadf1fb9e939239bf5c0a6ea4f14bc01cd48cc9","schema_version":"1.0","event_id":"sha256:65a533394448ddb2b324158bfcadf1fb9e939239bf5c0a6ea4f14bc01cd48cc9"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/P6QL2CBU5TY2UQK56IVXAWER4A/bundle.json","state_url":"https://pith.science/pith/P6QL2CBU5TY2UQK56IVXAWER4A/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/P6QL2CBU5TY2UQK56IVXAWER4A/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":"2026-08-04T15:35:23Z","links":{"resolver":"https://pith.science/pith/P6QL2CBU5TY2UQK56IVXAWER4A","bundle":"https://pith.science/pith/P6QL2CBU5TY2UQK56IVXAWER4A/bundle.json","state":"https://pith.science/pith/P6QL2CBU5TY2UQK56IVXAWER4A/state.json","well_known_bundle":"https://pith.science/.well-known/pith/P6QL2CBU5TY2UQK56IVXAWER4A/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2024:P6QL2CBU5TY2UQK56IVXAWER4A","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":"a3e383a5bf65c0decdbbbce3b07d0b36c2c126bf8c9f39bc98c2e1a4c9ef545a","cross_cats_sorted":["astro-ph.HE","gr-qc","hep-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2024-04-03T16:57:19Z","title_canon_sha256":"0047dd6fd3b5af94faa782d97907d949a98a424d46e6297f3b5ccae49f212404"},"schema_version":"1.0","source":{"id":"2404.02864","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2404.02864","created_at":"2026-07-05T08:04:02Z"},{"alias_kind":"arxiv_version","alias_value":"2404.02864v1","created_at":"2026-07-05T08:04:02Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2404.02864","created_at":"2026-07-05T08:04:02Z"},{"alias_kind":"pith_short_12","alias_value":"P6QL2CBU5TY2","created_at":"2026-07-05T08:04:02Z"},{"alias_kind":"pith_short_16","alias_value":"P6QL2CBU5TY2UQK5","created_at":"2026-07-05T08:04:02Z"},{"alias_kind":"pith_short_8","alias_value":"P6QL2CBU","created_at":"2026-07-05T08:04:02Z"}],"graph_snapshots":[{"event_id":"sha256:65a533394448ddb2b324158bfcadf1fb9e939239bf5c0a6ea4f14bc01cd48cc9","target":"graph","created_at":"2026-07-05T08:04:02Z","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/2404.02864/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Pulsar Timing Array (PTA) observations hinted towards the existence of a stochastic gravitational wave background (SGWB) in the nHz frequency band. Still, the nature of the SGWB signal cannot be confidently inferred from current data, and the leading explanation invokes mergers of supermassive black holes. If confirmed, such discovery would not only represent a turning point in our understanding of astrophysics, but it may severely limit the capability of searching for additional cosmological sources in the nHz frequency range. In this work, we build a simple framework to forecast the sensitiv","authors_text":"Gabriele Franciolini, Mauro Pieroni, Mikel Falxa, Stanislav Babak","cross_cats":["astro-ph.HE","gr-qc","hep-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2024-04-03T16:57:19Z","title":"Forecasting the sensitivity of Pulsar Timing Arrays to gravitational wave backgrounds"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2404.02864","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:d9325ee24da4082e143ed3a83d86596607e3e9ad7c3c86deb860d19820cb2052","target":"record","created_at":"2026-07-05T08:04:02Z","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":"a3e383a5bf65c0decdbbbce3b07d0b36c2c126bf8c9f39bc98c2e1a4c9ef545a","cross_cats_sorted":["astro-ph.HE","gr-qc","hep-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2024-04-03T16:57:19Z","title_canon_sha256":"0047dd6fd3b5af94faa782d97907d949a98a424d46e6297f3b5ccae49f212404"},"schema_version":"1.0","source":{"id":"2404.02864","kind":"arxiv","version":1}},"canonical_sha256":"7fa0bd0834ecf1aa415df22b705891e00fa727e50f209c4f7ddeae7c10f772e4","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7fa0bd0834ecf1aa415df22b705891e00fa727e50f209c4f7ddeae7c10f772e4","first_computed_at":"2026-07-05T08:04:02.120881Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T08:04:02.120881Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"KK6LbIDax9TRop3Ezl2m7h/WrXcGygxGJvP0uhu6gVGf6djtZbXIloN41AZc2QloJ2VbEvml64FzppXZwBavDw==","signature_status":"signed_v1","signed_at":"2026-07-05T08:04:02.121297Z","signed_message":"canonical_sha256_bytes"},"source_id":"2404.02864","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d9325ee24da4082e143ed3a83d86596607e3e9ad7c3c86deb860d19820cb2052","sha256:65a533394448ddb2b324158bfcadf1fb9e939239bf5c0a6ea4f14bc01cd48cc9"],"state_sha256":"bc1d1e2f75c7a751c933d86d543a4bdbe267a32ccffec6168efa6a83ef230c5f"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"DYQ2nXokP3BbgaeqQVTsrnjQrpsEcIs/otg3clqAFBuvQI9hFBb8xQBhxY0I1bCuyy1OQaptjwgYStyPGkgJDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-04T15:35:23.451153Z","bundle_sha256":"ecad4cee14627ee2f1aee4f0770be6528aa3d84093c0a1c67cccac66db8d7af7"}}