{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:PUCNUCY4DQQM3HPEZ2OMRVMZEC","short_pith_number":"pith:PUCNUCY4","canonical_record":{"source":{"id":"2511.21933","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2025-11-26T21:45:19Z","cross_cats_sorted":["astro-ph.CO","astro-ph.IM"],"title_canon_sha256":"550637782bb0be78eb2f265fbc608ac23a7806f159822662f05e1d3c92fc23c0","abstract_canon_sha256":"99fb084edac325505091263377b9adf524ec24a62bff7fc72a6344ef318dcdeb"},"schema_version":"1.0"},"canonical_sha256":"7d04da0b1c1c20cd9de4ce9cc8d599208abd7e01416444ce2cc39905f3d19497","source":{"kind":"arxiv","id":"2511.21933","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2511.21933","created_at":"2026-05-27T14:06:39Z"},{"alias_kind":"arxiv_version","alias_value":"2511.21933v1","created_at":"2026-05-27T14:06:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2511.21933","created_at":"2026-05-27T14:06:39Z"},{"alias_kind":"pith_short_12","alias_value":"PUCNUCY4DQQM","created_at":"2026-05-27T14:06:39Z"},{"alias_kind":"pith_short_16","alias_value":"PUCNUCY4DQQM3HPE","created_at":"2026-05-27T14:06:39Z"},{"alias_kind":"pith_short_8","alias_value":"PUCNUCY4","created_at":"2026-05-27T14:06:39Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:PUCNUCY4DQQM3HPEZ2OMRVMZEC","target":"record","payload":{"canonical_record":{"source":{"id":"2511.21933","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2025-11-26T21:45:19Z","cross_cats_sorted":["astro-ph.CO","astro-ph.IM"],"title_canon_sha256":"550637782bb0be78eb2f265fbc608ac23a7806f159822662f05e1d3c92fc23c0","abstract_canon_sha256":"99fb084edac325505091263377b9adf524ec24a62bff7fc72a6344ef318dcdeb"},"schema_version":"1.0"},"canonical_sha256":"7d04da0b1c1c20cd9de4ce9cc8d599208abd7e01416444ce2cc39905f3d19497","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-27T14:06:39.148549Z","signature_b64":"EvM7SHoVSdHoTM0GxbUvfv0k1XnbjyFB+QQNewepDnKveblpvycGgQ8BJPq205OEQU4g2Bw1qOlggqlPPyyQBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"7d04da0b1c1c20cd9de4ce9cc8d599208abd7e01416444ce2cc39905f3d19497","last_reissued_at":"2026-05-27T14:06:39.147407Z","signature_status":"signed_v1","first_computed_at":"2026-05-27T14:06:39.147407Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2511.21933","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":"2026-05-27T14:06:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Z+v4OjjVPlN2KqxTuhK1ejFl95XPEh0le6XMbVIMBb4M4v1InYp9chPwZ+bNJkJs4elFEIgm4ApqGoP+YwsPBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-27T11:05:17.503478Z"},"content_sha256":"457fa761fe43f4de5ba3a54a4485146fb74d4ef4b4a6364fdb4ac73804d0ec83","schema_version":"1.0","event_id":"sha256:457fa761fe43f4de5ba3a54a4485146fb74d4ef4b4a6364fdb4ac73804d0ec83"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:PUCNUCY4DQQM3HPEZ2OMRVMZEC","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Data span and frequency coverage requirements for robust detection and inference in PTAs: A case study with EPTA DR2","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO","astro-ph.IM"],"primary_cat":"astro-ph.HE","authors_text":"Alberto Sesana, Federico Fantoccoli, Golam Mohiuddin Shaifullah, Irene Ferranti, Mikel Falxa","submitted_at":"2025-11-26T21:45:19Z","abstract_excerpt":"Pulsar Timing Arrays (PTAs) are approaching the sensitivity required for a $5\\sigma$ detection of the nanohertz stochastic gravitational-wave background (GWB). This makes it crucial to deeply understand the behaviour of our analysis pipelines. A counterintuitive feature of the European Pulsar Timing Array (EPTA) second data release is that restricting the dataset to the last 10.3 years (DR2new) increases the inferred GWB significance from $\\leq2\\sigma$ for the full 25-year dataset (DR2full) to $\\geq3.5\\sigma$. We investigate whether this behaviour indicates an anomaly or is a possible outcome "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2511.21933","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/2511.21933/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":"2026-05-27T14:06:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"tnjJgg2Q37ID4eFUjE/z5FthJscKptMvHVYWDQyt+C7WSeezMu3Wr9EQA+e00a42CBJK+Dam//Ppz3rjG+RPDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-27T11:05:17.503851Z"},"content_sha256":"e5809675c3e9a1f6e63ef955847c5d7715217d168e1ef93909e5612006f8b5fc","schema_version":"1.0","event_id":"sha256:e5809675c3e9a1f6e63ef955847c5d7715217d168e1ef93909e5612006f8b5fc"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/PUCNUCY4DQQM3HPEZ2OMRVMZEC/bundle.json","state_url":"https://pith.science/pith/PUCNUCY4DQQM3HPEZ2OMRVMZEC/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/PUCNUCY4DQQM3HPEZ2OMRVMZEC/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":"2026-06-27T11:05:17Z","links":{"resolver":"https://pith.science/pith/PUCNUCY4DQQM3HPEZ2OMRVMZEC","bundle":"https://pith.science/pith/PUCNUCY4DQQM3HPEZ2OMRVMZEC/bundle.json","state":"https://pith.science/pith/PUCNUCY4DQQM3HPEZ2OMRVMZEC/state.json","well_known_bundle":"https://pith.science/.well-known/pith/PUCNUCY4DQQM3HPEZ2OMRVMZEC/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:PUCNUCY4DQQM3HPEZ2OMRVMZEC","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":"99fb084edac325505091263377b9adf524ec24a62bff7fc72a6344ef318dcdeb","cross_cats_sorted":["astro-ph.CO","astro-ph.IM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2025-11-26T21:45:19Z","title_canon_sha256":"550637782bb0be78eb2f265fbc608ac23a7806f159822662f05e1d3c92fc23c0"},"schema_version":"1.0","source":{"id":"2511.21933","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2511.21933","created_at":"2026-05-27T14:06:39Z"},{"alias_kind":"arxiv_version","alias_value":"2511.21933v1","created_at":"2026-05-27T14:06:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2511.21933","created_at":"2026-05-27T14:06:39Z"},{"alias_kind":"pith_short_12","alias_value":"PUCNUCY4DQQM","created_at":"2026-05-27T14:06:39Z"},{"alias_kind":"pith_short_16","alias_value":"PUCNUCY4DQQM3HPE","created_at":"2026-05-27T14:06:39Z"},{"alias_kind":"pith_short_8","alias_value":"PUCNUCY4","created_at":"2026-05-27T14:06:39Z"}],"graph_snapshots":[{"event_id":"sha256:e5809675c3e9a1f6e63ef955847c5d7715217d168e1ef93909e5612006f8b5fc","target":"graph","created_at":"2026-05-27T14:06:39Z","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/2511.21933/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Pulsar Timing Arrays (PTAs) are approaching the sensitivity required for a $5\\sigma$ detection of the nanohertz stochastic gravitational-wave background (GWB). This makes it crucial to deeply understand the behaviour of our analysis pipelines. A counterintuitive feature of the European Pulsar Timing Array (EPTA) second data release is that restricting the dataset to the last 10.3 years (DR2new) increases the inferred GWB significance from $\\leq2\\sigma$ for the full 25-year dataset (DR2full) to $\\geq3.5\\sigma$. We investigate whether this behaviour indicates an anomaly or is a possible outcome ","authors_text":"Alberto Sesana, Federico Fantoccoli, Golam Mohiuddin Shaifullah, Irene Ferranti, Mikel Falxa","cross_cats":["astro-ph.CO","astro-ph.IM"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2025-11-26T21:45:19Z","title":"Data span and frequency coverage requirements for robust detection and inference in PTAs: A case study with EPTA DR2"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2511.21933","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":"sha256:457fa761fe43f4de5ba3a54a4485146fb74d4ef4b4a6364fdb4ac73804d0ec83","target":"record","created_at":"2026-05-27T14:06:39Z","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":"99fb084edac325505091263377b9adf524ec24a62bff7fc72a6344ef318dcdeb","cross_cats_sorted":["astro-ph.CO","astro-ph.IM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2025-11-26T21:45:19Z","title_canon_sha256":"550637782bb0be78eb2f265fbc608ac23a7806f159822662f05e1d3c92fc23c0"},"schema_version":"1.0","source":{"id":"2511.21933","kind":"arxiv","version":1}},"canonical_sha256":"7d04da0b1c1c20cd9de4ce9cc8d599208abd7e01416444ce2cc39905f3d19497","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7d04da0b1c1c20cd9de4ce9cc8d599208abd7e01416444ce2cc39905f3d19497","first_computed_at":"2026-05-27T14:06:39.147407Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-27T14:06:39.147407Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"EvM7SHoVSdHoTM0GxbUvfv0k1XnbjyFB+QQNewepDnKveblpvycGgQ8BJPq205OEQU4g2Bw1qOlggqlPPyyQBw==","signature_status":"signed_v1","signed_at":"2026-05-27T14:06:39.148549Z","signed_message":"canonical_sha256_bytes"},"source_id":"2511.21933","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:457fa761fe43f4de5ba3a54a4485146fb74d4ef4b4a6364fdb4ac73804d0ec83","sha256:e5809675c3e9a1f6e63ef955847c5d7715217d168e1ef93909e5612006f8b5fc"],"state_sha256":"9e53db4682c49be9404144fba25a6d64018ddb9734bb5610d99b4d2978dfc511"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"DO9y7opxSpdWRqbkkjl9asf6NpSsRg22bcRG+dbW5oLMbNhG3QS2pa6Id2L3YdDDp/endpYI6GBFMAvxv6cUDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-27T11:05:17.505950Z","bundle_sha256":"4795ca71f5d0616935b357d8b9d35b5d58f68e69bd4dfb6b1ebf4ce2100d4d4f"}}