{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:CPICEERUMWX7U3OZGOD6A2R5NA","short_pith_number":"pith:CPICEERU","canonical_record":{"source":{"id":"1804.00454","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2018-04-02T11:33:57Z","cross_cats_sorted":[],"title_canon_sha256":"0c7f750f5a2c238cd2058e7554312907f5f6777d62037f28ef563f276736720d","abstract_canon_sha256":"045c42d08753f6ea5bdff14e5e08ba26ee5f118a7ae46d726d13bcb67e253d1b"},"schema_version":"1.0"},"canonical_sha256":"13d022123465affa6dd93387e06a3d683f6ac8414c7f939c7ac0b625b4e62d87","source":{"kind":"arxiv","id":"1804.00454","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1804.00454","created_at":"2026-05-18T00:14:07Z"},{"alias_kind":"arxiv_version","alias_value":"1804.00454v1","created_at":"2026-05-18T00:14:07Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1804.00454","created_at":"2026-05-18T00:14:07Z"},{"alias_kind":"pith_short_12","alias_value":"CPICEERUMWX7","created_at":"2026-05-18T12:32:16Z"},{"alias_kind":"pith_short_16","alias_value":"CPICEERUMWX7U3OZ","created_at":"2026-05-18T12:32:16Z"},{"alias_kind":"pith_short_8","alias_value":"CPICEERU","created_at":"2026-05-18T12:32:16Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:CPICEERUMWX7U3OZGOD6A2R5NA","target":"record","payload":{"canonical_record":{"source":{"id":"1804.00454","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2018-04-02T11:33:57Z","cross_cats_sorted":[],"title_canon_sha256":"0c7f750f5a2c238cd2058e7554312907f5f6777d62037f28ef563f276736720d","abstract_canon_sha256":"045c42d08753f6ea5bdff14e5e08ba26ee5f118a7ae46d726d13bcb67e253d1b"},"schema_version":"1.0"},"canonical_sha256":"13d022123465affa6dd93387e06a3d683f6ac8414c7f939c7ac0b625b4e62d87","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:14:07.951440Z","signature_b64":"C1u9MZ656LWG6TNRusudo82LCCgKvEFVDecVYhUiuguz/JA9CATNm+5QZF6MxrMOdX2RnZYhWdMx+47ZmTLkBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"13d022123465affa6dd93387e06a3d683f6ac8414c7f939c7ac0b625b4e62d87","last_reissued_at":"2026-05-18T00:14:07.950968Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:14:07.950968Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1804.00454","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":"2026-05-18T00:14:07Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"GnNgEzsNz58aefJmYtoNwf/3NQhG2g8pEspkcRw6QE9IyVA+FgKjq+GO6FG+T7I9ayB+izROBrwO8nhmjFI5Aw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T19:22:17.549366Z"},"content_sha256":"3708d9a477a9f3903c6bd68930aa7881ada3597026b6444451860f2d61c7e306","schema_version":"1.0","event_id":"sha256:3708d9a477a9f3903c6bd68930aa7881ada3597026b6444451860f2d61c7e306"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:CPICEERUMWX7U3OZGOD6A2R5NA","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Predictions for measuring the cross power spectrum of the HI 21-cm signal and the Lyman-$\\alpha$ forest using OWFA","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Anjan Kumar Sarkar, Somnath Bharadwaj, Tapomoy Guha Sarkar","submitted_at":"2018-04-02T11:33:57Z","abstract_excerpt":"We have studied the possibility of measuring the cross-correlation of the redshifted HI 21-cm signal and the Lyman-$\\alpha$ forest using an upcoming radio-interferometric array OWFA and an spectroscopic observation like SDSS-IV. Our results shows that it is possible to have a $6 \\sigma$ detection of the cross-correlation signal with OWFA PII using an observing time of $200$ hrs each in $N_p = 25$ independent fields-of-view. However, not much can be done beyond this using the cross-correlation signal for $z_c = 3.35$ and $B = 30 \\, {\\rm MHz}$. Apart from this, we have also envisaged a situation"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1804.00454","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":""},"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":"2026-05-18T00:14:07Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"rR8pnb8/AzovHyUUfVPxLdFEWHVgBLvjMB+XjlRCHReu+pAOZCeXKx6ZNKK0COkYWV/b6qRVSRxxtsy+ASozBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T19:22:17.550043Z"},"content_sha256":"98934763b1bcb726bba45390d5482ed98591773ed317488d28725ae1e87b1f23","schema_version":"1.0","event_id":"sha256:98934763b1bcb726bba45390d5482ed98591773ed317488d28725ae1e87b1f23"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/CPICEERUMWX7U3OZGOD6A2R5NA/bundle.json","state_url":"https://pith.science/pith/CPICEERUMWX7U3OZGOD6A2R5NA/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/CPICEERUMWX7U3OZGOD6A2R5NA/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":"2026-05-30T19:22:17Z","links":{"resolver":"https://pith.science/pith/CPICEERUMWX7U3OZGOD6A2R5NA","bundle":"https://pith.science/pith/CPICEERUMWX7U3OZGOD6A2R5NA/bundle.json","state":"https://pith.science/pith/CPICEERUMWX7U3OZGOD6A2R5NA/state.json","well_known_bundle":"https://pith.science/.well-known/pith/CPICEERUMWX7U3OZGOD6A2R5NA/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:CPICEERUMWX7U3OZGOD6A2R5NA","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":"045c42d08753f6ea5bdff14e5e08ba26ee5f118a7ae46d726d13bcb67e253d1b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2018-04-02T11:33:57Z","title_canon_sha256":"0c7f750f5a2c238cd2058e7554312907f5f6777d62037f28ef563f276736720d"},"schema_version":"1.0","source":{"id":"1804.00454","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1804.00454","created_at":"2026-05-18T00:14:07Z"},{"alias_kind":"arxiv_version","alias_value":"1804.00454v1","created_at":"2026-05-18T00:14:07Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1804.00454","created_at":"2026-05-18T00:14:07Z"},{"alias_kind":"pith_short_12","alias_value":"CPICEERUMWX7","created_at":"2026-05-18T12:32:16Z"},{"alias_kind":"pith_short_16","alias_value":"CPICEERUMWX7U3OZ","created_at":"2026-05-18T12:32:16Z"},{"alias_kind":"pith_short_8","alias_value":"CPICEERU","created_at":"2026-05-18T12:32:16Z"}],"graph_snapshots":[{"event_id":"sha256:98934763b1bcb726bba45390d5482ed98591773ed317488d28725ae1e87b1f23","target":"graph","created_at":"2026-05-18T00:14:07Z","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":"We have studied the possibility of measuring the cross-correlation of the redshifted HI 21-cm signal and the Lyman-$\\alpha$ forest using an upcoming radio-interferometric array OWFA and an spectroscopic observation like SDSS-IV. Our results shows that it is possible to have a $6 \\sigma$ detection of the cross-correlation signal with OWFA PII using an observing time of $200$ hrs each in $N_p = 25$ independent fields-of-view. However, not much can be done beyond this using the cross-correlation signal for $z_c = 3.35$ and $B = 30 \\, {\\rm MHz}$. Apart from this, we have also envisaged a situation","authors_text":"Anjan Kumar Sarkar, Somnath Bharadwaj, Tapomoy Guha Sarkar","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2018-04-02T11:33:57Z","title":"Predictions for measuring the cross power spectrum of the HI 21-cm signal and the Lyman-$\\alpha$ forest using OWFA"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1804.00454","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":"sha256:3708d9a477a9f3903c6bd68930aa7881ada3597026b6444451860f2d61c7e306","target":"record","created_at":"2026-05-18T00:14:07Z","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":"045c42d08753f6ea5bdff14e5e08ba26ee5f118a7ae46d726d13bcb67e253d1b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2018-04-02T11:33:57Z","title_canon_sha256":"0c7f750f5a2c238cd2058e7554312907f5f6777d62037f28ef563f276736720d"},"schema_version":"1.0","source":{"id":"1804.00454","kind":"arxiv","version":1}},"canonical_sha256":"13d022123465affa6dd93387e06a3d683f6ac8414c7f939c7ac0b625b4e62d87","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"13d022123465affa6dd93387e06a3d683f6ac8414c7f939c7ac0b625b4e62d87","first_computed_at":"2026-05-18T00:14:07.950968Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:14:07.950968Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"C1u9MZ656LWG6TNRusudo82LCCgKvEFVDecVYhUiuguz/JA9CATNm+5QZF6MxrMOdX2RnZYhWdMx+47ZmTLkBA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:14:07.951440Z","signed_message":"canonical_sha256_bytes"},"source_id":"1804.00454","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3708d9a477a9f3903c6bd68930aa7881ada3597026b6444451860f2d61c7e306","sha256:98934763b1bcb726bba45390d5482ed98591773ed317488d28725ae1e87b1f23"],"state_sha256":"9b15830245c271608359bce8a69f627a5108cec7d07d8a68bd7b79f3bbee8ab6"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"MBBPuSm3fmK+rF46Vlucdy3ytqDBX8BlkLR0tCZ3PWPHSvXeGH3xEfu00lXMYazAvFVJ3rxhuBhyV2lrLRZGCg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-30T19:22:17.552897Z","bundle_sha256":"f80f47816f1150e8b0dbb4e3960c38f7f674f246d324c1c0115e7258c8f12b1a"}}