{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2020:ZU2AVREVEFHCW5YDG275TMVDFE","short_pith_number":"pith:ZU2AVREV","canonical_record":{"source":{"id":"2009.04418","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2020-09-09T17:06:04Z","cross_cats_sorted":["gr-qc"],"title_canon_sha256":"5559a2349bb3eae1f77f46203f0389529b3c2e17b20312d526fdb649915d44f1","abstract_canon_sha256":"a6feb21c29c9b06d6f031bea78f94bf748bb9d06546d1420403399933f0ea26a"},"schema_version":"1.0"},"canonical_sha256":"cd340ac495214e2b770336bfd9b2a3292fd2917e0b2152b60d8eb7f77c918e73","source":{"kind":"arxiv","id":"2009.04418","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2009.04418","created_at":"2026-07-05T01:58:21Z"},{"alias_kind":"arxiv_version","alias_value":"2009.04418v2","created_at":"2026-07-05T01:58:21Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2009.04418","created_at":"2026-07-05T01:58:21Z"},{"alias_kind":"pith_short_12","alias_value":"ZU2AVREVEFHC","created_at":"2026-07-05T01:58:21Z"},{"alias_kind":"pith_short_16","alias_value":"ZU2AVREVEFHCW5YD","created_at":"2026-07-05T01:58:21Z"},{"alias_kind":"pith_short_8","alias_value":"ZU2AVREV","created_at":"2026-07-05T01:58:21Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2020:ZU2AVREVEFHCW5YDG275TMVDFE","target":"record","payload":{"canonical_record":{"source":{"id":"2009.04418","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2020-09-09T17:06:04Z","cross_cats_sorted":["gr-qc"],"title_canon_sha256":"5559a2349bb3eae1f77f46203f0389529b3c2e17b20312d526fdb649915d44f1","abstract_canon_sha256":"a6feb21c29c9b06d6f031bea78f94bf748bb9d06546d1420403399933f0ea26a"},"schema_version":"1.0"},"canonical_sha256":"cd340ac495214e2b770336bfd9b2a3292fd2917e0b2152b60d8eb7f77c918e73","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T01:58:21.420661Z","signature_b64":"ia6Vx5P7EidJLs709y1tG9kpd5p2TeLz93k7lF1nots2HxOHzYrv9z9+c2bP3maiT4o91N4yzJq9UBhzToZCDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"cd340ac495214e2b770336bfd9b2a3292fd2917e0b2152b60d8eb7f77c918e73","last_reissued_at":"2026-07-05T01:58:21.420185Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T01:58:21.420185Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2009.04418","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T01:58:21Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"N+btYG+B6GjMvWt0ZqRkqRaRQN7hWpyzLBncRK8sBh7ubC3P/C1mmJSxRRjAeZ6ybr68F+PkoqnfF7QXUiSiCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-14T21:52:10.792426Z"},"content_sha256":"357974348c1fd916e0fae88507c1dd07c7187626b72cc011fcd3d52c47d39e45","schema_version":"1.0","event_id":"sha256:357974348c1fd916e0fae88507c1dd07c7187626b72cc011fcd3d52c47d39e45"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2020:ZU2AVREVEFHCW5YDG275TMVDFE","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Measuring the primordial gravitational-wave background in the presence of astrophysical foregrounds","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["gr-qc"],"primary_cat":"astro-ph.HE","authors_text":"Colm Talbot, Eric Thrane, Rory Smith, Sylvia Biscoveanu","submitted_at":"2020-09-09T17:06:04Z","abstract_excerpt":"Primordial gravitational waves are expected to create a stochastic background encoding information about the early Universe that may not be accessible by other means. However, the primordial background is obscured by an astrophysical foreground consisting of gravitational waves from compact binaries. We demonstrate a Bayesian method for estimating the primordial background in the presence of an astrophysical foreground. Since the background and foreground signal parameters are estimated simultaneously, there is no subtraction step, and therefore we avoid astrophysical contamination of the prim"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2009.04418","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/2009.04418/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":"2026-07-05T01:58:21Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"cJzc7S2dSCac5l/mFnPk61kPLZ+2loCZvA+uwlLs+2qseW95+Qm+Z7g3G3dY88/skKjM3w+LY8oA9aZUQZP5BA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-14T21:52:10.792810Z"},"content_sha256":"a81b6e030e8837ddd4f03ce4804d5e08c9837012c4abe4b38d7dc81cf2e88303","schema_version":"1.0","event_id":"sha256:a81b6e030e8837ddd4f03ce4804d5e08c9837012c4abe4b38d7dc81cf2e88303"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/ZU2AVREVEFHCW5YDG275TMVDFE/bundle.json","state_url":"https://pith.science/pith/ZU2AVREVEFHCW5YDG275TMVDFE/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/ZU2AVREVEFHCW5YDG275TMVDFE/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":"2026-07-14T21:52:10Z","links":{"resolver":"https://pith.science/pith/ZU2AVREVEFHCW5YDG275TMVDFE","bundle":"https://pith.science/pith/ZU2AVREVEFHCW5YDG275TMVDFE/bundle.json","state":"https://pith.science/pith/ZU2AVREVEFHCW5YDG275TMVDFE/state.json","well_known_bundle":"https://pith.science/.well-known/pith/ZU2AVREVEFHCW5YDG275TMVDFE/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2020:ZU2AVREVEFHCW5YDG275TMVDFE","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":"a6feb21c29c9b06d6f031bea78f94bf748bb9d06546d1420403399933f0ea26a","cross_cats_sorted":["gr-qc"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2020-09-09T17:06:04Z","title_canon_sha256":"5559a2349bb3eae1f77f46203f0389529b3c2e17b20312d526fdb649915d44f1"},"schema_version":"1.0","source":{"id":"2009.04418","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2009.04418","created_at":"2026-07-05T01:58:21Z"},{"alias_kind":"arxiv_version","alias_value":"2009.04418v2","created_at":"2026-07-05T01:58:21Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2009.04418","created_at":"2026-07-05T01:58:21Z"},{"alias_kind":"pith_short_12","alias_value":"ZU2AVREVEFHC","created_at":"2026-07-05T01:58:21Z"},{"alias_kind":"pith_short_16","alias_value":"ZU2AVREVEFHCW5YD","created_at":"2026-07-05T01:58:21Z"},{"alias_kind":"pith_short_8","alias_value":"ZU2AVREV","created_at":"2026-07-05T01:58:21Z"}],"graph_snapshots":[{"event_id":"sha256:a81b6e030e8837ddd4f03ce4804d5e08c9837012c4abe4b38d7dc81cf2e88303","target":"graph","created_at":"2026-07-05T01:58:21Z","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/2009.04418/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Primordial gravitational waves are expected to create a stochastic background encoding information about the early Universe that may not be accessible by other means. However, the primordial background is obscured by an astrophysical foreground consisting of gravitational waves from compact binaries. We demonstrate a Bayesian method for estimating the primordial background in the presence of an astrophysical foreground. Since the background and foreground signal parameters are estimated simultaneously, there is no subtraction step, and therefore we avoid astrophysical contamination of the prim","authors_text":"Colm Talbot, Eric Thrane, Rory Smith, Sylvia Biscoveanu","cross_cats":["gr-qc"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2020-09-09T17:06:04Z","title":"Measuring the primordial gravitational-wave background in the presence of astrophysical foregrounds"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2009.04418","kind":"arxiv","version":2},"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":"sha256:357974348c1fd916e0fae88507c1dd07c7187626b72cc011fcd3d52c47d39e45","target":"record","created_at":"2026-07-05T01:58:21Z","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":"a6feb21c29c9b06d6f031bea78f94bf748bb9d06546d1420403399933f0ea26a","cross_cats_sorted":["gr-qc"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2020-09-09T17:06:04Z","title_canon_sha256":"5559a2349bb3eae1f77f46203f0389529b3c2e17b20312d526fdb649915d44f1"},"schema_version":"1.0","source":{"id":"2009.04418","kind":"arxiv","version":2}},"canonical_sha256":"cd340ac495214e2b770336bfd9b2a3292fd2917e0b2152b60d8eb7f77c918e73","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"cd340ac495214e2b770336bfd9b2a3292fd2917e0b2152b60d8eb7f77c918e73","first_computed_at":"2026-07-05T01:58:21.420185Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T01:58:21.420185Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ia6Vx5P7EidJLs709y1tG9kpd5p2TeLz93k7lF1nots2HxOHzYrv9z9+c2bP3maiT4o91N4yzJq9UBhzToZCDg==","signature_status":"signed_v1","signed_at":"2026-07-05T01:58:21.420661Z","signed_message":"canonical_sha256_bytes"},"source_id":"2009.04418","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:357974348c1fd916e0fae88507c1dd07c7187626b72cc011fcd3d52c47d39e45","sha256:a81b6e030e8837ddd4f03ce4804d5e08c9837012c4abe4b38d7dc81cf2e88303"],"state_sha256":"93aee927b3b7a115bc4acec3e7dc8566e6abfe99173cef493bc87b1cdb65cfe4"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+kxWqfzjKFBfNI/DhVadM+O0DRVlCRvjGg5eBP+/BasdvGZTd6DPtPyDuvSvWpnD26G1Vrgrivj6hbjcjm0bCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-14T21:52:10.795047Z","bundle_sha256":"98dbc1407493548c127e37c6bff878e458c721c212d26c2a72c0fd3d6e4a829a"}}