{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:UZHC5NHYMZFJW2SXJLNBX3OSAX","short_pith_number":"pith:UZHC5NHY","canonical_record":{"source":{"id":"1508.00896","kind":"arxiv","version":5},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2015-08-04T20:04:54Z","cross_cats_sorted":[],"title_canon_sha256":"7ba4abc077e09578e1b55e38b8e60f8a1248f0bd6d44a71c260585ec40d3d89c","abstract_canon_sha256":"31d24f2955b8ffb1ba6e5ee71db7d068a3650d68549b7d46160c0ec52032a1a0"},"schema_version":"1.0"},"canonical_sha256":"a64e2eb4f8664a9b6a574ada1bedd205e09bd74e1f71829f7e49232661efe7ef","source":{"kind":"arxiv","id":"1508.00896","version":5},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1508.00896","created_at":"2026-05-18T01:22:06Z"},{"alias_kind":"arxiv_version","alias_value":"1508.00896v5","created_at":"2026-05-18T01:22:06Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1508.00896","created_at":"2026-05-18T01:22:06Z"},{"alias_kind":"pith_short_12","alias_value":"UZHC5NHYMZFJ","created_at":"2026-05-18T12:29:44Z"},{"alias_kind":"pith_short_16","alias_value":"UZHC5NHYMZFJW2SX","created_at":"2026-05-18T12:29:44Z"},{"alias_kind":"pith_short_8","alias_value":"UZHC5NHY","created_at":"2026-05-18T12:29:44Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:UZHC5NHYMZFJW2SXJLNBX3OSAX","target":"record","payload":{"canonical_record":{"source":{"id":"1508.00896","kind":"arxiv","version":5},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2015-08-04T20:04:54Z","cross_cats_sorted":[],"title_canon_sha256":"7ba4abc077e09578e1b55e38b8e60f8a1248f0bd6d44a71c260585ec40d3d89c","abstract_canon_sha256":"31d24f2955b8ffb1ba6e5ee71db7d068a3650d68549b7d46160c0ec52032a1a0"},"schema_version":"1.0"},"canonical_sha256":"a64e2eb4f8664a9b6a574ada1bedd205e09bd74e1f71829f7e49232661efe7ef","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:22:06.183231Z","signature_b64":"2CHwioVpzYjO9yaMxKsSZXIPPPq86AiXbfOgwx4MgTHnvux7Q1scWfzrijwQzoyJ1shuSfAmGyC/9pzIeEORCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a64e2eb4f8664a9b6a574ada1bedd205e09bd74e1f71829f7e49232661efe7ef","last_reissued_at":"2026-05-18T01:22:06.182720Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:22:06.182720Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1508.00896","source_version":5,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:22:06Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"9W5AK99jSwGJlF6WRWP0cXSZNDvwlnevVP5MCDtMwGB60QulIAejIg8v5WTcPRhrDKRNamGswy1H9OqyjFTrAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T16:34:23.083097Z"},"content_sha256":"acf0dddf9d42a741da982aa1dde6905ebabacda00885a62d55622f51fcb36021","schema_version":"1.0","event_id":"sha256:acf0dddf9d42a741da982aa1dde6905ebabacda00885a62d55622f51fcb36021"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:UZHC5NHYMZFJW2SXJLNBX3OSAX","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Statistics of the epoch of reionization 21-cm signal - I. Power spectrum error-covariance","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Rajesh Mondal (IIT Kharagpur), Somnath Bharadwaj (IIT Kharagpur), Suman Majumdar (Stockholm U)","submitted_at":"2015-08-04T20:04:54Z","abstract_excerpt":"The non-Gaussian nature of the epoch of reionization (EoR) 21-cm signal has a significant impact on the error variance of its power spectrum $P({\\bf \\textit{k}})$. We have used a large ensemble of semi-numerical simulations and an analytical model to estimate the effect of this non-Gaussianity on the entire error-covariance matrix ${\\mathcal{C}}_{ij}$. Our analytical model shows that ${\\mathcal{C}}_{ij}$ has contributions from two sources. One is the usual variance for a Gaussian random field which scales inversely of the number of modes that goes into the estimation of $P({\\bf \\textit{k}})$. "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1508.00896","kind":"arxiv","version":5},"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":"2026-05-18T01:22:06Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Fw38tp2DQfn5KziitpAG4HAnHiq84qLdZi5bDY8S0XPFki2v6LcNWlcFh+dWNotf91mwlHqLpgFb932Ouy9ACw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T16:34:23.083736Z"},"content_sha256":"db543b9fd06b4f32e4fa8d9c250d5cbd6140122ee253ecd0f796d0de3b4f313d","schema_version":"1.0","event_id":"sha256:db543b9fd06b4f32e4fa8d9c250d5cbd6140122ee253ecd0f796d0de3b4f313d"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/UZHC5NHYMZFJW2SXJLNBX3OSAX/bundle.json","state_url":"https://pith.science/pith/UZHC5NHYMZFJW2SXJLNBX3OSAX/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/UZHC5NHYMZFJW2SXJLNBX3OSAX/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":"2026-05-27T16:34:23Z","links":{"resolver":"https://pith.science/pith/UZHC5NHYMZFJW2SXJLNBX3OSAX","bundle":"https://pith.science/pith/UZHC5NHYMZFJW2SXJLNBX3OSAX/bundle.json","state":"https://pith.science/pith/UZHC5NHYMZFJW2SXJLNBX3OSAX/state.json","well_known_bundle":"https://pith.science/.well-known/pith/UZHC5NHYMZFJW2SXJLNBX3OSAX/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:UZHC5NHYMZFJW2SXJLNBX3OSAX","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":"31d24f2955b8ffb1ba6e5ee71db7d068a3650d68549b7d46160c0ec52032a1a0","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2015-08-04T20:04:54Z","title_canon_sha256":"7ba4abc077e09578e1b55e38b8e60f8a1248f0bd6d44a71c260585ec40d3d89c"},"schema_version":"1.0","source":{"id":"1508.00896","kind":"arxiv","version":5}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1508.00896","created_at":"2026-05-18T01:22:06Z"},{"alias_kind":"arxiv_version","alias_value":"1508.00896v5","created_at":"2026-05-18T01:22:06Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1508.00896","created_at":"2026-05-18T01:22:06Z"},{"alias_kind":"pith_short_12","alias_value":"UZHC5NHYMZFJ","created_at":"2026-05-18T12:29:44Z"},{"alias_kind":"pith_short_16","alias_value":"UZHC5NHYMZFJW2SX","created_at":"2026-05-18T12:29:44Z"},{"alias_kind":"pith_short_8","alias_value":"UZHC5NHY","created_at":"2026-05-18T12:29:44Z"}],"graph_snapshots":[{"event_id":"sha256:db543b9fd06b4f32e4fa8d9c250d5cbd6140122ee253ecd0f796d0de3b4f313d","target":"graph","created_at":"2026-05-18T01:22:06Z","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 non-Gaussian nature of the epoch of reionization (EoR) 21-cm signal has a significant impact on the error variance of its power spectrum $P({\\bf \\textit{k}})$. We have used a large ensemble of semi-numerical simulations and an analytical model to estimate the effect of this non-Gaussianity on the entire error-covariance matrix ${\\mathcal{C}}_{ij}$. Our analytical model shows that ${\\mathcal{C}}_{ij}$ has contributions from two sources. One is the usual variance for a Gaussian random field which scales inversely of the number of modes that goes into the estimation of $P({\\bf \\textit{k}})$. ","authors_text":"Rajesh Mondal (IIT Kharagpur), Somnath Bharadwaj (IIT Kharagpur), Suman Majumdar (Stockholm U)","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2015-08-04T20:04:54Z","title":"Statistics of the epoch of reionization 21-cm signal - I. Power spectrum error-covariance"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1508.00896","kind":"arxiv","version":5},"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:acf0dddf9d42a741da982aa1dde6905ebabacda00885a62d55622f51fcb36021","target":"record","created_at":"2026-05-18T01:22:06Z","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":"31d24f2955b8ffb1ba6e5ee71db7d068a3650d68549b7d46160c0ec52032a1a0","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2015-08-04T20:04:54Z","title_canon_sha256":"7ba4abc077e09578e1b55e38b8e60f8a1248f0bd6d44a71c260585ec40d3d89c"},"schema_version":"1.0","source":{"id":"1508.00896","kind":"arxiv","version":5}},"canonical_sha256":"a64e2eb4f8664a9b6a574ada1bedd205e09bd74e1f71829f7e49232661efe7ef","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a64e2eb4f8664a9b6a574ada1bedd205e09bd74e1f71829f7e49232661efe7ef","first_computed_at":"2026-05-18T01:22:06.182720Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:22:06.182720Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"2CHwioVpzYjO9yaMxKsSZXIPPPq86AiXbfOgwx4MgTHnvux7Q1scWfzrijwQzoyJ1shuSfAmGyC/9pzIeEORCw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:22:06.183231Z","signed_message":"canonical_sha256_bytes"},"source_id":"1508.00896","source_kind":"arxiv","source_version":5}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:acf0dddf9d42a741da982aa1dde6905ebabacda00885a62d55622f51fcb36021","sha256:db543b9fd06b4f32e4fa8d9c250d5cbd6140122ee253ecd0f796d0de3b4f313d"],"state_sha256":"dfaff1b5e8eecc53a113d474350d957cb14081dc32de0f17f70c15d46421496a"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"DoGlkwOkqqoBa5UzqNF1fkPr+NgVEd2RAIVwjvUqicadAEiXGCdojGqYvWsaPiaUMSx4Yc5+H4UMQ/+Q0SOPDg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-27T16:34:23.087221Z","bundle_sha256":"0299d4a5b05c82ad0efeee9b8a5ef48acfedf076bc99d2e92cbea0a0b26a37bc"}}