{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:L6DRJZ7B6IJW3ICE3V2735NQ3I","short_pith_number":"pith:L6DRJZ7B","canonical_record":{"source":{"id":"1202.3830","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2012-02-17T02:33:19Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"2aad1ff84df031f8c9d8dd534402ec3aa45d8c50c48ece6ff62e1dee91c365d2","abstract_canon_sha256":"f53c00cd81ac380ce7824e2a7b1c3a7a8607fcaac1a1270fe0f1135c289d0a1e"},"schema_version":"1.0"},"canonical_sha256":"5f8714e7e1f2136da044dd75fdf5b0da33297028a630711a6e90abfd88e63127","source":{"kind":"arxiv","id":"1202.3830","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1202.3830","created_at":"2026-05-18T01:58:24Z"},{"alias_kind":"arxiv_version","alias_value":"1202.3830v2","created_at":"2026-05-18T01:58:24Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1202.3830","created_at":"2026-05-18T01:58:24Z"},{"alias_kind":"pith_short_12","alias_value":"L6DRJZ7B6IJW","created_at":"2026-05-18T12:27:14Z"},{"alias_kind":"pith_short_16","alias_value":"L6DRJZ7B6IJW3ICE","created_at":"2026-05-18T12:27:14Z"},{"alias_kind":"pith_short_8","alias_value":"L6DRJZ7B","created_at":"2026-05-18T12:27:14Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:L6DRJZ7B6IJW3ICE3V2735NQ3I","target":"record","payload":{"canonical_record":{"source":{"id":"1202.3830","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2012-02-17T02:33:19Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"2aad1ff84df031f8c9d8dd534402ec3aa45d8c50c48ece6ff62e1dee91c365d2","abstract_canon_sha256":"f53c00cd81ac380ce7824e2a7b1c3a7a8607fcaac1a1270fe0f1135c289d0a1e"},"schema_version":"1.0"},"canonical_sha256":"5f8714e7e1f2136da044dd75fdf5b0da33297028a630711a6e90abfd88e63127","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:58:24.245410Z","signature_b64":"p7zv7o1NLNC8LoeWpqjcbUWYDsfgSBVQX0HxEhly7wMgxBYYRvJZDKPVLypgSZ5aBphxhxMklXuqYQSHsUvTBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"5f8714e7e1f2136da044dd75fdf5b0da33297028a630711a6e90abfd88e63127","last_reissued_at":"2026-05-18T01:58:24.244918Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:58:24.244918Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1202.3830","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":"2026-05-18T01:58:24Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"LIh/JJ+aNtyxrCMz/uV+EOIhuwBK3UoNv1cU4fgccHJ6jVYCPTb9zBji6hZw8uUsBONWSzOisdl7U1V5X/IMCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-27T20:53:19.398396Z"},"content_sha256":"1c861bfe1c4f6141e74da105f3e4b52095fa1bab5c9a75af13ddafd8b22797af","schema_version":"1.0","event_id":"sha256:1c861bfe1c4f6141e74da105f3e4b52095fa1bab5c9a75af13ddafd8b22797af"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:L6DRJZ7B6IJW3ICE3V2735NQ3I","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Four Fundamental Foreground Power Spectrum Shapes for 21 cm Cosmology Observations","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"astro-ph.IM","authors_text":"Adam Beardsley, Bryna Hazelton, Ian Sullivan, Miguel F. Morales","submitted_at":"2012-02-17T02:33:19Z","abstract_excerpt":"Contamination from instrumental effects interacting with bright astrophysical sources is the primary impediment to measuring Epoch of Reionization and BAO 21 cm power spectra---an effect called mode-mixing. In this paper we identify four fundamental power spectrum shapes produced by mode-mixing that will affect all upcoming observations. We are able, for the first time, to explain the wedge-like structure seen in advanced simulations and to forecast the shape of an 'EoR window' that is mostly free of contamination. Understanding the origins of these contaminations also enables us to identify c"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1202.3830","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":""},"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":"2026-05-18T01:58:24Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"tgH/1tlxRlbJImU3el7s0AWTAURy/mInDCBPramHcwGUrmdHJsyCR4r2u/LD4ZJrnnRIK6D8F2wbhtxPHrSbDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-27T20:53:19.398750Z"},"content_sha256":"0fa911c0cc1fd7d781f8b7d9a0ca873112291dcef262d8eb4aab7776eb786836","schema_version":"1.0","event_id":"sha256:0fa911c0cc1fd7d781f8b7d9a0ca873112291dcef262d8eb4aab7776eb786836"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/L6DRJZ7B6IJW3ICE3V2735NQ3I/bundle.json","state_url":"https://pith.science/pith/L6DRJZ7B6IJW3ICE3V2735NQ3I/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/L6DRJZ7B6IJW3ICE3V2735NQ3I/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":"2026-06-27T20:53:19Z","links":{"resolver":"https://pith.science/pith/L6DRJZ7B6IJW3ICE3V2735NQ3I","bundle":"https://pith.science/pith/L6DRJZ7B6IJW3ICE3V2735NQ3I/bundle.json","state":"https://pith.science/pith/L6DRJZ7B6IJW3ICE3V2735NQ3I/state.json","well_known_bundle":"https://pith.science/.well-known/pith/L6DRJZ7B6IJW3ICE3V2735NQ3I/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:L6DRJZ7B6IJW3ICE3V2735NQ3I","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":"f53c00cd81ac380ce7824e2a7b1c3a7a8607fcaac1a1270fe0f1135c289d0a1e","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2012-02-17T02:33:19Z","title_canon_sha256":"2aad1ff84df031f8c9d8dd534402ec3aa45d8c50c48ece6ff62e1dee91c365d2"},"schema_version":"1.0","source":{"id":"1202.3830","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1202.3830","created_at":"2026-05-18T01:58:24Z"},{"alias_kind":"arxiv_version","alias_value":"1202.3830v2","created_at":"2026-05-18T01:58:24Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1202.3830","created_at":"2026-05-18T01:58:24Z"},{"alias_kind":"pith_short_12","alias_value":"L6DRJZ7B6IJW","created_at":"2026-05-18T12:27:14Z"},{"alias_kind":"pith_short_16","alias_value":"L6DRJZ7B6IJW3ICE","created_at":"2026-05-18T12:27:14Z"},{"alias_kind":"pith_short_8","alias_value":"L6DRJZ7B","created_at":"2026-05-18T12:27:14Z"}],"graph_snapshots":[{"event_id":"sha256:0fa911c0cc1fd7d781f8b7d9a0ca873112291dcef262d8eb4aab7776eb786836","target":"graph","created_at":"2026-05-18T01:58:24Z","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":"Contamination from instrumental effects interacting with bright astrophysical sources is the primary impediment to measuring Epoch of Reionization and BAO 21 cm power spectra---an effect called mode-mixing. In this paper we identify four fundamental power spectrum shapes produced by mode-mixing that will affect all upcoming observations. We are able, for the first time, to explain the wedge-like structure seen in advanced simulations and to forecast the shape of an 'EoR window' that is mostly free of contamination. Understanding the origins of these contaminations also enables us to identify c","authors_text":"Adam Beardsley, Bryna Hazelton, Ian Sullivan, Miguel F. Morales","cross_cats":["astro-ph.CO"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2012-02-17T02:33:19Z","title":"Four Fundamental Foreground Power Spectrum Shapes for 21 cm Cosmology Observations"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1202.3830","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":"sha256:1c861bfe1c4f6141e74da105f3e4b52095fa1bab5c9a75af13ddafd8b22797af","target":"record","created_at":"2026-05-18T01:58:24Z","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":"f53c00cd81ac380ce7824e2a7b1c3a7a8607fcaac1a1270fe0f1135c289d0a1e","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2012-02-17T02:33:19Z","title_canon_sha256":"2aad1ff84df031f8c9d8dd534402ec3aa45d8c50c48ece6ff62e1dee91c365d2"},"schema_version":"1.0","source":{"id":"1202.3830","kind":"arxiv","version":2}},"canonical_sha256":"5f8714e7e1f2136da044dd75fdf5b0da33297028a630711a6e90abfd88e63127","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"5f8714e7e1f2136da044dd75fdf5b0da33297028a630711a6e90abfd88e63127","first_computed_at":"2026-05-18T01:58:24.244918Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:58:24.244918Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"p7zv7o1NLNC8LoeWpqjcbUWYDsfgSBVQX0HxEhly7wMgxBYYRvJZDKPVLypgSZ5aBphxhxMklXuqYQSHsUvTBQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:58:24.245410Z","signed_message":"canonical_sha256_bytes"},"source_id":"1202.3830","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:1c861bfe1c4f6141e74da105f3e4b52095fa1bab5c9a75af13ddafd8b22797af","sha256:0fa911c0cc1fd7d781f8b7d9a0ca873112291dcef262d8eb4aab7776eb786836"],"state_sha256":"534f0778890caa3ad106a3c9edada355142e8635e99fbaf1322f91003a796bf0"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"O/jDLo9R1gKbk/vdDk9EpBT75yzU6/Sa7ttRnFSDYHxnocf46w7rZTTB/jFlo0VpG+S5xO7Mx9SN+KvmIlbaCQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-27T20:53:19.400676Z","bundle_sha256":"b321f7107aa35b9f4ae26b51f7e4cc1af479abbcd9f0836794f4b18a2720c74a"}}